National Academy of Sciences of the Republic of Armenia
ՀԱՅ  ENG  РУС
Home academy [@] sci.am Facebook Page
General Page About Academy Divisions Organizations Members Contact us
Yervant Zorian
Dr., Professor
COVID-19
Structure
Presidium Members
Documents
Innovation Proposals
Publications
Funds
Conferences
Competitions
Photogallery
Videogallery
Web Resources
Other Academies
"Gitutyun" newspaper
"In the World of Science" Journal
Publications in Press
Notices
Anniversaries
Universities
News
Scientific Results
Diaspora Department presents
Young Scientist Tribune
Our Honored Figures
Announcements
Lindau Nobel Laureate Meeting
Sitemap
Scientific Results
11/04/2022
The Institute of Geophysics and Engineering Seismology after A.Nazarov of NAS RA has studied the dependence of the formation of seismic precursors formation on the mechanism of expected strong earthquakes focus

The Institute of Geophysical Engineering Seismology of NAS RA has studied the dependence of the formation of seismic precursors formation on the mechanism of the expected strong earthquakes focus.

Mariam Mkrtchyan, the head of the research, a senior researcher at the Seismology and Earthquake Prediction Laboratory, explains: "In our studies we have used the well-known fact that in the period preceding expected strong (M≥6.0) earthquakes, periodic fluctuations of weak seismicity can be observed, the fluctuations are detected in the focus zone of the expected earthquake during 3-5 years, reaching a maximum before 0.6-1.8 years.

Aiming to study the anomalous regime of weak seismicity in the focus zone of the expected strong earthquake, we have conducted a retrospective analysis of the seismic situation prior to a number of strong earthquakes in the highlands of Armenia and the adjacent regions. We have carried out the localization of the expected strong earthquake focus zone formation according to the spatial-temporal picture of the epicenters of the previous weak earthquakes on the base of the peculiarities of the background seismicity. A significant characteristic of background seismicity has been confirmed: over time the epicenters of weak earthquakes are exposed to migration to the expected strong earthquake focus zone. A process of grouping and centralization takes place. Being a feature of strong earthquakes this phenomenon is manifested in a wide range of energy levels of weak earthquakes".

Weak or foreshock earthquakes preceding a strong earthquake are combined with creep phenomena (landslides) along the fault. They can be considered as seismic forerunners in the solving of earthquake prediction problems. This regularity was confirmed in the Parkfield area of the USA, on the territory of the San Andreas fault.

However, earthquakes often occur, the formation mechanism of which is not related to creep phenomena and when seismicity background activation as foreshocks is not observed.  The catastrophic earthquake in Spitak in Armenia in 1988 was of that kind. It did not have a series of foreshock earthquakes, only two foreshocks took place (one of them - very weak, the other with M = 3 magnitude) 16 hours before the strong shock. Data of other geophysical fields of the area before this earthquake did not allow the detection of any significant anomaly that could be considered a forerunner. Certain atmospheric-biological forerunners were observed, but they did not show an unambiguous connection with this earthquake.

These peculiarities have been used to study the characteristics of physical processes occurring in expected strong earthquake focuses by comparing them with the parameters of earthquake focus mechanisms.

"It turns out that when the type of mechanism of an expected strong earthquake is an upthrow fault or an overfaultt, especially in the zone of high pressure and in the conditions of a sharp drop of the fracture plane - ≥60o, weak seismic activity is either absent or very weak, for example Spitak focus zone. In the case of a type of a strike-slip mechanism, when creep shifts occur in the tectonic seam of the fault system, seismicity is activated in the form and regularities of spatial-temporal distribution specific to weak earthquakes, for example, during the strong Van earthquakes of 1976 and 2011 in the Anatolian fault zone. Thus, the comparison of earthquake data with the parameters of the focus mechanisms and further analysis show that in the perception of the expected strong earthquake focuses formation it is often necessary to take into account the specifics of seismogenic zones, fault zones of the Earth crust," said Mariam Mkrtchyan.

The research was carried out within the framework of thematic-basic financing programs in the Department of Seismology of the Institute of Geophysics and Engineering Seismology after A.Nazarov of NAS RA.

The main results of the work were reported at the conferences: "Problems of Geocosmos" (St. Petersburg) and "Spitak Earthquake. 30 Years Later. Experience and Perspectives" (Yerevan). An offer was received to submit the article to the "Universal Journal of Geoscience".


Notices








On the 21st of February, 2024, The Institute of Language named after H. Acharyan of the National Academy of Sciences of the Republic of Armenia invites you to participate in the international conference "Current Problems of Studying and Teaching the Armenian Language". The conference will take place at the Institute of Language

Ս.թ. փետրվարի 23-ին ժ. 15:00-ին ՀՀ ԳԱԱ նիստերի դահլիճում (Բաղրամյան պող., 24) տեղի կունենա «Չընդհատված ծածկագիր. հայեր» գիտական ֆիլմի ցուցադրությունը և քննարկումը

The Shirak Center for Armenological Studies of NAS RA is starting to publish the 1 (27) volume of the "Scientific Works" journal for 2024. Priority is given to articles in English and Russian. The deadline for receiving articles is March 1, 2024

Международный инновационный центр нанотехнологий СНГ (МИЦНТ СНГ) при поддержке Межгосударственного фонда гуманитарного сотрудничества государств - участников СНГ (МФГС) и Объединенного института ядерных исследований объявляет о проведении конкурса на соискание грантов на разработку проектов в рамках деятельности МИЦНТ СНГ в 2024 году и очередной Стажировки молодых ученых и специалистов стран СНГ в Дубне в апреле - мае 2024года

The international conference "Armenia as a Civilizational Crossroad: Historical and Cultural Ties" is scheduled to take place from March 28 to 30, 2024, organized by the National Academy of Sciences of the Republic of Armenia and Yerevan State University

ՀՀ գիտության և տեխնիկայի զարգացման 2020-2024թթ. գերակայության ՀՀ կառավարության որոշման նախագիծ

Publications in Press
20/02/2024

«Գիտուժի» ներկայացուցիչների հետ քննարկվել են գիտահետազոտական ոլորտում պետական պատվերների ձևակերպման հարցեր
1lurer.am
19/02/2024

Երբ գիտության մեջ ես, շարժման մեջ ես. Լուսինե Համբարյան
ankakh.com
19/02/2024

Սևանի ձկնային պաշարները վտանգված են. իշխանի 2 տեսակ արհեստական պայմաններում է բազմացվում
1lurer.am
16/02/2024

Հայաստանը ես եմ. Նարինե Հայրապետյան
1tv.am
This site has been visited
6 847 981

times since 01.01.2005
National Academy of Sciences of the Republic of Armenia
NAS RA Logo (black, blue)
Top Website last updated on:  17:17, 20/02/2024 Top
General Page - About Academy - Divisions - Organizations - Members - Contact us - Structure - COVID-19
Presidium Members - Documents - Innovation Proposals - Publications - Funds - Conferences - Competitions
Photogallery - Videogallery - Web Resources - Other Academies - "Gitutyun" newspaper - "In the World of Science" Journal - Publications in Press
Notices - Anniversaries - Universities - News - Scientific Results - Diaspora Department presents - Young Scientist Tribune
Our Honored Figures - Announcements - Lindau Nobel Laureate Meeting - Sitemap
© Copyright 1998-2024 All Rights Reserved.
Website is created and supported by Academical Scientific Research Computer Network of Armenia (ASNET-AM)
For any suggestions write to webmaster {[ at ]} sci.am