MONITORING SEISMIC ACTIVITY IN DAMGHAN AND ADJACENT REGIONS BY A SMALL-APERTURE SEISMIC ARRAY

Publish Year: 1398
نوع سند: مقاله کنفرانسی
زبان: English
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SEE08_296

تاریخ نمایه سازی: 23 آبان 1399

Abstract:

In the aftermath of a series of moderate earthquakes which shook Damghan city and the neighboring townships in July 2019 a very small aperture seismic array was designed and deployed to Damghan city to monitor earthquakes. Preliminary analysis of data acquired relates to the reactivation of Astaneh and northern Damghan fault zones and possible rejuvenation of faults in the desert south of the city. Although the earthquake swarm did not cause substantial damage, it raised the alarm for a region which has been demolished in 856 AD after the most devastating earthquake in the Iranian plateau according to the historical records, suffered large casualties during 1953 earthquake and therefore stressed the need for monitoring seismic and geodetic stations currently absent in the region and also delineating seismogenic faults in the region. The rathersmall city of Damghan with about 60,000 inhabitants rests on a plain surrounded to north by a section of the Eastern Alborz mountains and to the south by traces of heights, bordering Great Kavir which are both seismically active and their activities are related to Astaneh and Torud fault zones (Figure 1). Astaneh fault is believed to be the cause of 856 AD which left 200,000 dead and injured tens of thousands people and has been recognized as the worst and most disastrous earthquake in history of Iran (Ambrasseys and Melville, 1981). Torud fault was also responsible for a deadly earthquake which occurred in 1953 that killed around 1000 people and destroyed city of Torud altogether.

Authors

Alireza ALINAGHI

Assistant Professor, IIEES, Tehran, Iran

Amir Pirooz KOLAHI-AZAR

Assistant Professor, School of Earth Sciences, Damghan University, Damghan, Iran

Seyed Saeedorreza ESLAMI

Assistant Professor, School of Earth Sciences, Damghan University, Damghan, Iran

Ali Akbar HASANNEZHAD

Assistant Professor, School of Earth Sciences, Damghan University, Damghan, Iran