Questions on measurements of the Earth’s crustal strain on the basis of GPS data on geodynamic moves of plates after earthquakes

2017 ◽  
Vol 919 (1) ◽  
pp. 40-44
Author(s):  
S.A. Ganiyeva ◽  
J.T. Mehdiyev
Keyword(s):  
Atmospheric Pressure ◽  
Main Shock ◽  
Complete Removal ◽  
Time Interval ◽  
Strong Earthquakes ◽  
The Earth ◽  
Shallow Earthquakes ◽  
Triangular Network ◽  
Gps System

It is well-known that strong shallow earthquakes are usually accompanied with series of aftershocks which can be explained by non-complete removal of strains, collected in the center during the main shock. But in some cases after some time interval the repeated strong earthquake happens in the same place. There are different versions for such repeated earthquakes. It is obvious, that all existing versions require presence or accumulation of strain in the active zone after the main shock which stress out the actuality of development of theoretical and methodological basics for assessment of strains on the basis of experimental data on plates motion. The importance of geodynamic research of remained strain at the Earth crust after strong earthquakes by way of calculation of remained strain on the basis of data plates is noted. It is shown, that utilization of GPS system for determination of shifts of plates could lead to error caused by shifts of GPS stations due to various causes.The consideration of the case where the non-stability of atmospheric pressure is a prevailing factor is reasoned. The related formulas for calculation of strain of the Earth crust on the basis of GPS measurements in the triangular network are given.

scholarly journals A project of creating atlas aftershocks of strong earthquakes

2019 ◽  
pp. 79-84
Author(s):  
A. V. Guglielmi ◽  
A. D. Zavyalov ◽  
O. D. Zotov
Keyword(s):  
Inverse Problem ◽  
Strong Earthquake ◽  
Main Shock ◽  
Earthquake Source ◽  
Problem Solution ◽  
Strong Earthquakes ◽  
Omori Law ◽  
The Earth ◽  
Interesting Possibility ◽  
Source Physics

The Omori Law, which describes the repeated underground shocks after a strong earthquake, is written in the form of a nonlinear differential equation. An idea of the focal deactivation coefficient after the main shock is introduced. Two advantages of the new wording of the Omori Law are given. Firstly, there is an interesting possibility to naturally take into account exogenous and endogenous triggers affecting the earthquake source. Endogenous triggers in the form of round-the-world seismic echo and free oscillations of the Earth, excited by the main shock, are especially noted. The second advantage is that the differential aftershock equation makes it possible to put the reverse problem of the earthquake source physics. The essence of the inverse problem is to determine the deactivation coefficient from the data on the observed aftershock frequency. Examples of inverse problem solution are given. The project of creation of the Atlas of aftershocks on the basis of the solution of the inverse problem of the source, cooling down after a strong earthquake is offered.

scholarly journals Global earthquakes in the 2021 first half according to the GS RAS

2021 ◽  
Vol 3 (3) ◽  
pp. 7-27
Author(s):  
Yuri Vinogradov ◽  
Marina Ryzhikova ◽  
Natalia Petrova ◽  
Svetlana Poygina ◽  
Marina Kolomiets
Keyword(s):  
Main Shock ◽  
Seismic Energy ◽  
Focal Mechanisms ◽  
Eastern Coast ◽  
Strong Earthquakes ◽  
The North ◽  
The Earth ◽  
Northern Mongolia ◽  
The Russian Federation ◽  
North Western

Data on the 2021 first half Earth seismicity at the level of strong earthquakes with magni-tudes mb6.0 according to the Alert Service of the Geophysical Survey RAS are given. The review also includes information on 81 earthquakes in Russia and adjacent territories, felt in the settlements of the Russian Federation. For 14 strong earthquakes, within one or two days after their occurrence, Informational messages were published, and information about the focal mechanisms was giving. The strongest earthquake of the Earth with MS=7.8 (Mw=8.1) occurred on March 4 at the Kermadec Islands, New Zealand. The largest human casualties and material damage during the study period were caused by catastrophic earth-quakes with MS=5.1 (Mw=5.8) and MS=5.9 (Mw=6.3), which occurred on January 14 at the Sulawesi Island, Indonesia. As a result of the earthquakes, 81 people died, 826 were injured. The strongest earthquake in Russia was the March 16 earthquake with MS=6.7 (Mw=6.6) off the eastern coast of Kamchatka. The maximum shaking intensity in Russia (I=6) was manifested by the strong Khuvsgul earthquake with MS=7.2 (Mw=6.8), which took place on January 11 in the Northern Mongolia, near the border with Russia. The position of the main shock and its aftershocks indicate the intensification of the seismic process in the north-western part of the Khuvsgul rift zone. According to the focal mechanisms of the main shock and two strong aftershocks, the stress of the northwest/southeast extension prevails in this zone, and the predominant slip type along the faults of the northeast strike is a nor-mal fault. The global seismic energy released in the 2021 first half remains, as in the previ-ous two years, at a reduced level, relative to the average for the last 11.5 years, which indi-cates a continuing seismic calm.

HADIS KURAIB DALAM KONSEP RUKYATUL HILAL

1970 ◽  
Vol 13 (2) ◽  
Author(s):  
Muslih Husein
Keyword(s):  
The West ◽  
The Earth ◽  
New Moon ◽  
The Republic

Hisab dan rukyat, hakikatnya, adalah cara untuk mengetahui pergantian bulan. Kajian ini memperlihatkan beberapa temuan. Pertama, korelasi antara hadis Kuraib dan terjadinya perbedaan penetapan awal Ramadan, Syawal, dan Dzul Hijjah di Indonesia. Kementerian Agama Republik Indonesia telah menetapkan bahwa Indonesia secara keseluruhan menjadi satu wilayah hukum (wilayatul hukmi). Kedua, tentang keberhasilan rukyat al-hilal di satu kawasan yang diberlakukan bagi kawasan lain di muka bumi. Perlu diketahui bersama bahwa visibilitas pertama hilal tidak meliputi seluruh muka bumi pada hari yang sama, melainkan membelahnya menjadi dua bagian: (1) bagian sebelah Barat yang dapat melihat hilal dan (2) bagian sebelah Timur yang tidak dapat melihat hilal.Hisab and rukyat is a way to know the turn of the month. This study shows several findings. First is the correlation between Kuraib traditions and differences in the determination of the beginning of Ramadan, Shawwal, and Dhul-Hijjah in Indonesia. Ministry of Religious Affairs of the Republic of Indonesia has stated that Indonesia as a whole into a single jurisdiction (wilayatul hukmi). Second, on the success rukyat alhilal in one area that applied to other regions of earth. Important to know that the first visibility of the new moon does not cover the entire face of the earth on the same day, but splitting it into two parts: (1) part of the West to see the new moon, and (2) part of the East were not able to see the new moon.

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