EC project "Review of Historical Seismicity in Europe" (RHISE) 1989-1993

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Christa Hammerl *

*Institüt Meteorologie und Geophysik, Universität Wien,
UZA II, Stiege G, Ebene 5, Norbergstraße 17, 1090 Wien, Austria.

The earthquake of January 25th, 1348:
discussion of sources

In the afternoon of January 25th, 1348, a serious earthquake occurred. The epicentral area was believed to be located in the Austrian town Villach and parts of the Dobratsch mountain slid into the valley. Estimates of the number of people killed ranged from 5,000 to 10,000. This might be the information on this earthquake, if you summarise the numerous but heterogenic reports on that earthquake published since the event. The various studies on that earthquake have been written from different viewpoints: the seismological, historical, and philosophical aspect, the aspect of a natural catastrophe, etc.
Fig. 1 shows the assessment of its parameters according to five studies selected among those published between 1940 and 1985.
Fig. 2 and Fig. 3 show two macroseismic maps of the 1348 event as emerging respectively from Ambraseys (1976) and Gentile et al. (1985). The fact that these two maps differ even in the near-field area, the differences in epicentral intensity, magnitude and epicentre location (Fig. 1) suggested the necessity of a re-consideration of this earthquake from the point of view of historical investigation. So the 1348 earthquake had been extensively studied as a case history (Hammerl, 1992) to process the historical source material in the best possible manner employing the science of history, its auxiliary sciences and subsidiary branches, as well as by means of special, interdisciplinary methods.
A complete documentation of the sources and a precise description of the procedure should make this study transparent for any subsequent studies, which may be geared to other specific tasks, such as questions on seismicity posed by engineers (building of large technical constructions, etc.).

Fig. 1 - Parameters of the 25th January 1348 earthquake from the studies considered.

Fig. 2 - Effect distribution of the 1348 earthquake (from Ambraseys, 1976).

Fig. 3 - Effect distribution of the 1348 earthquake (from Gentile et al., 1985).

Sources and their interdependencies
To get an impression for which localities one could expect information on earthquake effects ñ and for this purpose only ñ I studied the far-field of the May 6, 1976 Friuli earthquake. Therefore, the sources produced in those localities contained in an area enclosed in a circle wider than the far-field area of the 1976 earthquake were investigated to find information on the 1348 earthquake.
More than two hundred contemporary sources were investigated; among them 110 contained information concerning this earthquake. Fig. 4 shows the place of origin of each source, containing or not records on the earthquake of 1348. Most of the sources are annals and chronicles which, for this period, are in most cases edited and more or less easily available. Archival documents were investigated for the area of Carinthia.

Why did the news of this earthquake spread so far? What is the reason that so much was written about this earthquake, when only a small number of sources state that the earthquake has been actually felt? This last point is important for the evaluation. The fact that the earthquake is reported, must not lead to conclude that the earthquake was truly felt in that locality.
As will be shown at the end of this paper, north of Villach the earthquake was felt in nine places only. In spite of this, many sources have their origin north of Villach, i.e. the news of the earthquake spread there more widely than in the southern regions.
The significance of this ascertainment lies in the fact that previous studies on this earthquake do not often differentiate between the places where the sources originated and those where it was "actually felt". When studies on the earthquake (e.g. Ambraseys, 1976; Karnik et al., 1957) state Lübeck as the northernmost boundary of the felt area, this is not only incorrect in itself, but all parameters based on it might also be quantificated incorrectly.

Fig. 4 - Place of origin of sources on the 1348 earthquake. Black dots indicate sources containing information on the event.

If Fig. 5 is consulted to answer the question why the news of this earthquake spread so widely in the northern region, the map suggests some reasons for assuming that the spreading of the news is mostly related to the distribution of monastic communities. With the exception of some locations, in all places of origin of the sources there were monasteries.
The news of the earthquake spread in particular throughout the Benedictine and Cistercian orders. The former was probably informed due to the damage to the Benedictine monastery in Arnoldstein, which was reported by travelling monks. The reason why Cistercian monasteries were so well informed even in the far north (Oliva, near Danzig) was probably due to the annual general chapter held in France, so that the abbots had detailed information on special events, and entered this information into their annals and chronicles in their own words.

Fig. 5 - Place of origin of sources and authors typology.

It is doubtful whether the earthquake was actually felt at the Benedictine abbey of Weihenstephan (near Augsburg); more likely the source constitutes a free interpretation of information supplied by the brothers at Arnoldstein. A similar account is found in the writings of Albertus Argentinensis (XIV); he might have learned of the earthquake from the Benedictine monks in Würzburg or from bishop Berthold of Strasbourg, who was well informed.
It is very unlikely that the earthquake was felt in Erfurt. Were the monks of the Benedictine abbey Saint Peter influenced by news from Arnoldstein? Only the Cronicae S. Petri Erford. Cont. II (XIVa) speaks of a great earthquake in Erfurt, probably a confusion with another earthquake or a deformed information about the 1348 earthquake. The Cronicae S. Petri Erford. Additamentum (XIVc) only contains a general remark, whereas the Cronicae S. Petri Erford. Cont. III (XIVb) talks of Aquileia. The Benedictines at Ellwangen (Chronicon Elwacense, XV) mention destructions in the Friuli area. The Benedictine monk Goswin of Marienberg (XIV) noticed, among other catastrophes, the destruction of castles, fortresses and cities in Carinthia. Summarising, one can say that the sources from Benedictine monasteries are neither identical, nor do they contain similarities. This leads to the conclusion that the news were not carried from one Benedictine monastery to the next, but spread throughout the monastic communities.

A detailed study of the Cistercians should be started at Friesach. Friesach is the Cistercian settlement closest to the epicentre of the earthquake as assessed by the above mentioned studies. The second "closest" Cistercian monastery was at Neuberg, the chronicle of which focused on Villach as the centre of destruction. Like the Dominicans at Friesach (Annales Frisacenses Continuatio, XIV) (the news of the earthquake originate at the Dominican monastery), the Cistercians at Zwettl (Annales Zwetlenses, XIV) also mention destroyed fortresses, in addition to damage in Carinthia, Styria and Carniola. The Cistercian Benessii de Weitmil (XIV) reports of Villach and destroyed fortresses, but giving his text an apocalyptic setting. The Cistercian monasteries of Pairis (Annales Parisienses, XIV) and Oliva (Chronica Olivensis, XIV) also knew of Villach and destroyed castles and fortresses. A certain connection becomes apparent in the Cistercian records; perhaps the abbots were indeed informed of the natural catastrophe at their annual convention already mentioned.

Although the Dominican monk Heinrich von Herford (XIV) lived at Minden, far away from the most damaged area, he reported several facts about the earthquake. He states to have taken this information from a letter to the provincial prior of the German province. Anonymus Leobiensis (XIV) had fairly accurate knowledge of the damage in Carinthia. Could it be that the information of this anonymous author was derived from the Dominican monastery at Leoben? The Dominicans at Friesach also reported the effects of the earthquake in Carinthia, as they had felt it themselves. A common characteristic in Dominican sources is, above all, the relatively good information on the effects the earthquake had in Carinthia.
In comparison, the places of origin of sources south of Villach are mostly secular in nature. In the Italian regions, the news were spread mostly by travelling merchants who were eyewitnesses of the earthquake. The secular chroniclers probably obtained the information from them, and in addition, many of the chroniclers had experienced the earthquake in their own towns, as most reports of damage and of the fact that the earthquake had been felt come from the regions south of Villach.

Discussion of the main sources
The best report on earthquake effects in Villach was given by the priest Andreas von Regensburg (1380-1438), who quoted eyewitness reports of merchants from Regensburg and Prague. The names of the eyewitnesses are documented, namely Heinreich der Sterner and Hainreich Pawnburger, merchants from Regensburg, and Stockner, a merchant from Prague. They themselves survived the earthquake, whereas their four journeymen died. Andreas von Regensburg (XIV) reports that

"the earthquake was so intense that Villach was destroyed, including the walls of the fortress, the monastery and church(es) and that, with the exception of 11 merlons, all walls and towers collapsed. In the middle of the town the earth split open and water stinking of sulphur broke forth which flowed off again. In Carniola and Carinthia, the fortress Kellerberg, the monastery Arnoldstein and 36 other castles were destroyed. There were landslides and the dammed up water devastated an area of more than ten miles. The earthquake lasted for 8 days and created crevasses deep enough to swallow a man up to his belt".
It is not the place here to quote all the sources examined for the town of Villach; but studying the surviving sources written within 50 years after the earthquake, published by Wiessner (1968), it appears that the "ordinary life in a medieval town" was not consequently influenced by the earthquake; that means that the town of Villach was neither destroyed completely nor that the earthquake caused heavy damage.
The chronicle written by Giovanni Villani (XIV) was continued by his brother Matteo until 1363; the entire report is an original account. Before quoting a letter of some Florentine merchants, Giovanni Villani himself writes that terrible earthquakes of varying intensity had occurred in Italy, in Pisa, Bologna and Padua, but particularly in Venice, in which innumerable stacks or chimneys collapsed, also several church towers and many houses. To Giovanni Villani, who himself became a victim to the plague in the summer of 1348, the earthquake was an apocalyptic omen, because he says that the earthquake meant disaster and pestilence for the places concerned. He goes on to say "...that in that night it was also dangerous in Friuli, Aquileia and large parts of Germany...".
I do not want to attribute too much value to his general statements on damage in Pisa, Bologna, Padua, Venice and Aquileia, as Villani seems to have obtained this information only from hearsay and included it for the sake of completeness:
"... That is how it was, and the events were so bad that one would not believe them, if they were reported orally or in writing. [To show] that we tell the truth and not lies, we enclose [in our report] the copy of a letter which some credible merchants from Florence sent from there. We stick closely to their testimonies, which they laid down in writing in Udine in February 1347" Villani writes on.
The description of damage in the letter of the Florentine merchants, dated February 1347 (Florentine calendar!), is very valuable, as they were eyewitnesses of the earthquake. These merchants certainly saw some of the damage they mentioned themselves or heard about it from other merchants who were also on the great trade route from Austria to Italy, via St. Veit (on the Glan river), Feldkirchen and Villach (Fig. 6).

Fig. 6 - Trade routes in the 14th century.

However, Villani does not state where the Florentine merchants were at the time of the earthquake. They describe the effects of the earthquake in the places along this trade route in the following order: Sacile, San Daniele, Ragogna, Gemona, Venzone, Tolmezzo, Wasserleonburg, Federaun, Villach, Arnoldstein, Ossiach and Feldkirchen. It is interesting that the merchants, like Villani, keep referring to divine omens and finally the Last Judgement, which corresponds with the interpretation of natural phenomena at that time.

Another very detailed description of the effects in this area is given in the contemporary history of Bertrand, the patriarch of Aquileia (Nicoletti, XIV). His description of damage in Venice, Villach, Federaun and Arnoldstein is more detailed, of the earthquake effects in Friuli more general, as he mentions damage to Udine, Cividale, Gemona, Tolmin and Flagogna in one breath. The great damage to the church of Aquileia is mentioned in particular, as this is, of course, of great importance to him:
"Ö Ma fra gli orrendi guasti che questo flagello meno nella Provincia nostra il maggiore toccò alla Chiesa d'Aquileja, la quale fu in tal modo rovinata da far meraviglia e dolore all'intero Friuli."

Information on damage east to north-east of Gemona is almost exclusively found in the Gesta Bertholdi (Mathias von Neuenburg, XIVa, b). It is difficult to say exactly why the bishop of Strasbourg had such exact information on this area. One assumption is that he, being Grand Master of the Teutonic Order, was informed by the members of the order in Friesach, another that he obtained his information because of his connections to the Habsburgs.
The Gesta reports that the following castles and settlements were destroyed: Waldenstein, Liemberg, Reifnitz, Wildenstein, Krainburg, Osterberg, Wallenberg, Wasserleonburg, Ortenburg and Rosegg. Ortenburg, Wasserleonburg, Osterberg and Federaun are also mentioned by Detmar (XIV), the Franciscan from Lübeck; however, he started his chronicle only in 1385 and obtained his information from other chronicles, reports, etc. Among other sources, Detmar probably also used the Gesta Bertholdi by Mathias von Neuenburg (XIVa) as a reference. Detmar lists partly distorted names for a series of destroyed castles, so that not all of them can be identified. The destruction of Ortenburg castle, the ancestral seat of the Earl of Ortenburg, is also mentioned in the Bozner Chronik (XIV).
Villani and the Florentine merchants only named Wasserleonburg, Federaun, Arnoldstein, Ossiach and Feldkirchen in that area. Was that because these sites were the closest ones to the trade route?
It is interesting to note that Kellerberg Castle is mentioned in two totally different sources, i.e. by Andreas von Regensburg (XIV), who quotes merchants from Regensburg and Prague, and by the Anonymus Leobiensis (XIV). The merchants quoted by Andreas von Regensburg mention Villach and Arnoldstein, perhaps also because these places are situated along the trade route (Fig. 6). Why Anonymus Leobiensis particularly mentions Kellerberg, Hollenburg, Arnoldstein and Villach is not quite clear.
Other places mentioned by several contemporary sources are Udine (3 sources), Aquileia (4 sources), Venice (4 sources) and Padua (4 sources).
Giovanni da Parma (XIV), canon at Trient, only heard about damage in Udine: "Even worse news are told by people coming from abroad: half of the palace of Udine, which belongs to the patriarch of Aquileia, has collapsed...". Nicoletti (XIV) mentions damage in Udine in one breath with that in other places. Yet the Florentine merchants' account of the collapse of the patriarchal palace and some other houses is credible, as they spent some time in Udine.
The damage to the church of Aquileia is mentioned by Belloni (XIV): he reports a testimony by Gubertino, who - as secretary to the patriarch of Aquileia - should know about it in detail ("At postquam Basilicam Aquilejensem terrae tremor dejeceratÖ"); the Florentine merchants ("Ö it was also dangerous in Friuli, Aquileja during this nightÖ"); the history of the patriarch of Aquileia (Nicoletti, XIV) ("Öil maggiore [guasto] toccò alla Chiesa d'Aquileja, la quale fu in tal modo rovinata da far meraviglia e dolore all'intero Friuli"). The Cron. S. Petri Erford. (Additamentum, XIVc) reports on Aquileia only in general terms ("Quedam insignis civitas nomine Aquileja penitus deleta est et absorbita per predictum terre motum") and, of course, can have obtained the information only by hearsay. Anyway, damage to the basilica is well documented.
In his introduction, Villani mentions strong shocks in Venice, but does not go into details, i.e. he only had second-hand information on it. The history of the patriarch of Aquileia lists the damaged parts in detail, probably from correspondence among the patriarchs ("Ö In Venezia oltre molti edifizi pubblici e privati, precipitarono i campanili di S. Silvestro, di S. Giacomo dall'Orio e di S. Vitale, cosi la cima della Chiesa di S. Angelo e la parte manca della Chiesa di S. BasilioÖ"). A Franciscan chronicle of Bologna (Corpus chronicorum Bononiensium, XIV), which was written before 1394, also mentions a great earthquake in Venice, but probably drew on various other sources for information ("Ö e grandissimo fu in quell'ora in Venezia, e gran novità ivi furono nelle case, e in Messere San Marco, che' è la lor Chiesa principaleÖ"). The following inscription can still be seen on the former Scuola della Carità (Venezia e la Peste, 1978):
"In nome de Dio eterno e de la Biada Vergene Maria. In l'ano de la Incarnacion del nostro signor miser iesu Christo MCCCXLVII a dì XXV de çener lo dì de la conversion de Sen Polo, cerca ora de vespero fo gran taramoto in Veniexia e quasi per tuto el mondo e caçe molte cime de campanili e case e camini e la glesia de Sen Baseio, e fo sì gran spavento che quaxi tuta la çente pensava di morir, e non stete, la tera de tremar cerca dì XL; e può driedo questo començà una gran mortalitadeÖ".

In Villani's introduction, great shocks are also mentioned to have occurred in Padua; his message is not very detailed. The contemporary Liber Regiminum Padue (XIV) does not report damage in Padua; it only mentions an earthquake on that day. The Chronicon Patavinum (XIV) only mentions a great earthquake all over the world. The chronicle by Guglielmo Cortusi (XIV) for the period 1237-1358, but written in the years 1315 to 1358, reports in contemporary style:

"The Almighty God, who does not want the sinner to die, but to convert and stay alive, first threatens and then strikes mankind with incredible, with unheard of blows, he started His horrifying judgement first at the (mankind) in order to better and not to destroy it. As it was His will to strike outer end of the world, in the East. But after having struck the Tartars, the Turks and all of the tribes of the infidels, a great earthquake of half an hour occurred in 1348, on the 25th of January, at 11 p.m. to the horror of the Christians."
In conclusion, no damage at Padua can be deduced from these sources.

Effects in other localities are mentioned by a minor number of sources. The Notae Veronenses (XIV), written by an inhabitant of Verona, mention a strong earthquake in Verona, however, in February, on St. Paul's Day (not expressly St. Paul's Conversion, which can lead to mistakes). This section is followed by the ominous conjunction of the planets Mars and Jupiter.

Approximately 20 years after the earthquake, the Italian humanist, philologist and poet, Francesco Petrarca (XIV), in a letter dedicated to the archbishop of Genoa, wrote:
"Ö I was sitting in my library, at Verona at that time, and although I was not totally unfamiliar with this matter, I was highly bewildered by the sudden and new occurrences. The floor was trembling under my feet, and when, from all sides, the books bumped one another and fell down, I was shocked, hurried from the room and saw the servants and soon also other people running to and fro with fright. There was deathly pallor on all faces."
Summarising, these reports do not mention any damage in Verona.
Giovanni da Parma (XIV) reports as follows about the earthquake in Trient:
"Be it known to all who want to hear it that in the year 1348 after the birth of the Lord, there was a slight earthquake in the first indication, around vespers time on January 25, that is on the festival of the Conversion of Saint Paul, followed almost without interruption by a second one of such magnitude, that the campanile of S. Maria was swaying to and fro from the shocks, so that the bells hanging on it started to ring on their own account, and the water truly spattered from the baptismal fonts. The earthquake lasted so long that one could have easily said slowly three 'Lord's Prayers and three 'Hail Mary's".
This source seems to be the reliable testimony of an eyewitness. Interesting in this connection is the fact that for instance Mariani (1673), who wrote his account 300 years later using the chronicle by Giovanni da Parma, had the campanile of S. Maria collapse, which had only swayed in da Parma's account. Such distortion of information in the course of time is a well-known phenomenon; later accounts always have to be examined very carefully.
The Chronicon Estense (XIV) was continued by contemporaries in Ferrara from 1340 to 1354, who noted a strong earthquake in it. The contemporary report by the Dominican Bartolomeo da Ferrara (XIV) is based on the Chronicon Estense. Thus one can say that the earthquake was strongly felt in Ferrara, but that there was no damage.
In his Rhymed chronicle, Bonamente Aliprandi (XIV), doctor of law from Mantua (d. 1417), briefly mentions the earthquake, which caused no damage, so you can infer that the earthquake caused no major damage in Mantua, but you cannot necessarily conclude that it did not cause minor damage. In this case the lower limit ought to be interpreted as "earthquake felt", the upper one with "slight damage". The gap between "felt" and "slight damage" may comprise up to three ratings on the intensity scale.
Villani mentions Bologna in his introduction only, which, as said above, has little value. A Franciscan chronicle of Bologna (Corpus chronicorum Bononiensium, XIV) speaks in general terms of a strong earthquake which, after all, could also refer to Bologna. Only Cherubino Ghirardacci (1596-1657), in his Historia of Bologna, mentions damage:
"... it was such a great earthquake that it frightened the whole town of Bologna, then towards the Square and the Galleria Street many houses collapsed and some palaces and towers started to move due to the severe vibration ...".
As the Franciscan chronicle does not report damage, in my opinion the earthquake was merely felt in Bologna.
Pisa is the southernmost town mentioned, and in Villani's introduction only. This information is somewhat doubtful.
The Annales Cremonenses (Cavitelli, 1588) state "Ö earth shocks could be felt, through which in Cremona, where Otto de Bonis was praetor; in Lodi, Milano and Venice houses collapsed". This is the only source I have on Cremona, Lodi, and Milano: at least, one can conclude that the earthquake was felt there.
In Mozzanica, a small locality south-east of Milano, an eyewitness wrote the following note (ASMi, XIV):
"In the year 1348 / on the 25th day of January, Friday / at vespers time the earth trembles mightily / towers and houses all over the world are trembling / people fell down dazed with fear. I, Giovanni de Lene, wrote the stated poetical verses from my own experience with my own hand at the moment when the earth trembled."
Although these lines have been written in a poetical form, nevertheless one can assume that the earthquake was really felt there.
Both the physician Giovanni Agazzari (XV), born 1413 in Piacenza, in his Chronica Civitatis Placentiae, and Iohannes de Mussis, also from Piacenza, in his Chronicon Placentinum (XIV) (original from 1375 onwards), state in the very same words that the earthquake was felt in Piacenza. Agazzari could have borrowed this information from de Mussis.

Finally, the sources do not contain reliable data on the number of people killed by the 1348 event, even if they repeatedly speak of very many dead.

Fig. 7 and 8 show the effect distribution of the earthquake, in which the more reliable data, assessed from the critically examined sources, were taken into account for the individual localities.

Fig. 7 - Distribution of the main effects of the January 25th, 1348 earthquake.

Most of the previous studies on this earthquake, such as those mentioned in the introduction, located the epicentral area in Villach. There is abundance of information on the earthquake of 1348. Unfortunately there is a minor number of sources with regard to Villach and its vicinity, compared with the long list of texts mentioning the earthquake in a merely general context.
It is interesting in this context that 40 percent of the more than 100 sources reporting on this earthquake ñ and examined for the case study ñ mention the town of Villach and its vicinity. With all these describing a catastrophe in this town and its surroundings, it is still worth questioning why the remaining 60% of the sources do not. The reason for stressing such heavy damage in Villach in the studies written centuries later after the earthquake could be that the authors were fascinated by the impressive mountain slide of the Dobratsch close to Villach and in the following period they would have overestimated the sources concerning Villach and the mountain slide and wrong interpretations of the sources increased.
In Fig. 7 and Fig. 8 one can see, that using contemporary sources heavy damage is concentrated in the Friuli area and damage is reported in some localities in the South of Carinthia, the Northwest of Slovenia and in the Northeast of Italy. The earthquake of January 25th, 1348 was probably felt from Bologna in the south, Milan in the west, Osterberg in the east and Friesach in the north.

Fig. 8 - Distribution of far-field effects of the the January 25th, 1348 earthquake.

This paper is based on the case study "Das Erdbeben vom 25. Jänner 1348 ñ Rekonstruktion des Naturereignisses" (Hammerl, 1992), which was partly financially supported by the Austrian Science Foundation under the project P6868 "Historische Seismizität in Mitteleuropa" and by the Austrian Academy of Science. This support is greatly appreciated.
The author would like to thank P. Albini and M. Stucchi for the critical and fruitful discussion.

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