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Unearthed in Ancient Text: The Lost Earthquake of 15th Century Italy

December 27, 2023
in Science
Unearthed in Ancient Text: The Lost Earthquake of 15th Century Italy
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Mountains Earthquake Concept

A note discovered in a 15th-century Hebrew prayer book by Paolo Galli reveals a previously unknown earthquake in Italy’s Marche region, offering vital insights into the country’s seismic history and drawing parallels to a similar event in 1799. Credit: SciTechDaily.com

The chance finding of a note in a 15th-century Hebrew prayer book fills an important gap in the historical Italian earthquake record, offering a brief glimpse of a previously unknown earthquake affecting the Marche region in the central Apennines.

Paolo Galli, who found the note in the Apostolic Vatican Library while looking for contemporaneous accounts of another historic Italian earthquake, writes in Seismological Research Letters that the note “not only helps us partially fill a gap in the seismic history of Italy but also prompts us to reflect on how we still do not know about seismogenesis even in times covered by written sources.”

The Importance of Historical Sources in Earthquake Research

“The wealth of historical sources in Italy is undoubtedly one of the richest, but it is equally subject to gaps both in terms of time and in places,” said Galli. “Unlike the Kingdom of Naples, for example, the production of documentation related to earthquakes has certainly been poorer in the Papal States, of which the Marche Region was a part in the 15th century.”

The note discovered by Galli was written on the leaf of the prayer book, which was copied in the Marche town of Camerino and completed in September-October 1446. The eight lines of the note describe an earthquake around Camerino that knocked down houses, the governor’s courtyard, and destroyed cities and villages “that have become a mound of stone.”

1446 Earthquake Note in Hebrew Prayer Book

Detail of folium 1 recto of manuscript Ross.499 in the Vatican library, reporting the news of the earthquake that struck Camerino and its neighboring settlements in 1446 (Biblioteca Apostolica Vaticana, available at https://www.vaticanlibrary.va). Credit: Digital Collection of the Biblioteca Apostolica Vaticana

Men and women “come here in Camerino dressed in white pale dresses with their horses and mules and donkeys loaded with bread and food and wine, in order to hold the hand of the poor,” the note relates, while stating that the earthquakes in the area continued from March to September.

The note is the only evidence of a damaging earthquake in the Marche region from the 15th century. Galli said a 1446 petition asking for funds to restore city walls and a castle in Petrino, a settlement 20 kilometers away from Camerino, may be the only other possible written indication of a damaging earthquake in the region.

A Rare Glimpse into the 15th Century Seismic Activity

There are only 450 documented earthquake site observations from Italy for the 15th century, and about half of those observations come from a key historic earthquake sequence in 1456 in the south-central Apennines. Galli had been looking through the library’s manuscripts from the Middle Ages to find more information about this sequence when he came across the prayer book.

“The earthquake of 1456, or rather, the earthquakes of 1456, represent the most catastrophic seismic sequence that occurred in the late Middle Ages in central-southern Italy,” he explained. “Despite the abundance of historical sources, particularly a specific treatise on the earthquake written by the famous humanist Giannozzo Manetti, we still do not have certainties about the different epicentral areas and, therefore, the parameters of individual mainshocks—magnitude and epicenter—and their seismic sources.”

The damage described in the prayer book note suggests that Camerino may have experienced intense shaking, measuring about an 8 on the Mercalli-Cancani-Sieberg intensity scale, Galli said. This level implies severe damage and partial collapse to half of the town’s buildings, along with the fall of columns, monuments, and walls.

Galli suggested the Camerino earthquake might have been a “twin” to a 1799 sequence in the region, where a magnitude 6.2 earthquake caused similar intense shaking.

“Of course, this is only a hypothesis, but by comparing the epicentral area and the level of damage in Camerino and its surroundings, it is possible that the effects described in our manuscript describe, albeit briefly, something similar to the event of 1799,” Galli noted.

“In particular, the manuscript mentions that many settlements around Camerino were reduced to piles of stones, indicating that the epicentral area was possibly the same as in 1799,” he added. “Similarly, the absence of information in the far field suggests that the earthquake was likely caused by a shallow-depth fault, as probably occurred in 1799.”

Reference: “All the People of Israel Are Friends: An Unknown Mid‐Fifteenth Century Earthquake in the Marche Region (Central Italian Apennines) Recorded in a Coeval Hebrew Manuscript” by Paolo Galli, 1 November 2023, Seismological Research Letters.
DOI: 10.1785/0220230209

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/unearthed-in-ancient-text-the-lost-earthquake-of-15th-century-italy/

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