Geomechanical models and ionospheric variations related to strongest earthquakes and weak influence of atmospheric pressure gradients     

V. G. Bondur  I. A. Garagash  M. B. Gokhberg  V. M. Lapshin  Yu. V. Nechaev  G. M. Steblov  S. L. Shalimov 《Doklady Earth Sciences》2007,414(1):666-669

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The 2019 Ridgecrest Large Earthquake in Southern California: Studying the Source Formation Based on Geomechanical Modelling     

Bondur  V. G.  Gokhberg  M. B.  Garagash  I. A.  Alekseev  D. A.  Gaponova  E. V. 《Doklady Earth Sciences》2022,502(1-2):41-45

Doklady Earth Sciences - Here we present a simulation of the crust’s stress–strain state in the period prior to the 2019 Ridgecrest (M = 7.1) earthquake in Southern California. In the...  相似文献   

Stress State Dynamics in Southern California from Geomechanical Monitoring Data before the М = 7.1 Earthquake of July 6, 2019     

Bondur  V. G.  Gokhberg  M. B.  Garagash  I. A.  Alekseev  D. A. 《Izvestiya Physics of the Solid Earth》2021,57(1):1-19

Izvestiya, Physics of the Solid Earth - Abstract—Since 2009, the stress-strain state (SSS) of the Earth’s crust in Southern California has been monitored using geomechanical modeling...  相似文献   

A Local Anomaly of the Stress State of the Earth’s Crust before the Strong Earthquake (M = 7.1) of July 5, 2019, in the Area of Ridgecrest (Southern California)     

Bondur  V. G.  Gokhberg  M. B.  Garagash  I. A.  Alekseev  D. A. 《Doklady Earth Sciences》2020,490(1):13-17

Doklady Earth Sciences - The evolution of the stress–strain state of the Earth’s crust in Southern California during the preparation period (from January 1, 2019 until August 15, 2019)...  相似文献   

Ionospheric response to submarine earthquake of March 11, 2011, in Japan according to GPS observations     

M. B. Gokhberg  G. M. Steblov  S. L. Shalimov  V. A. Veis  E. A. Grekhova 《Izvestiya Atmospheric and Oceanic Physics》2011,47(8):929-940

Using available Russian and international Global Positioning System (GPS) network data, we studied the ionospheric response to the M = 8.9 submarine earthquake of March 11, 2011, on the northeastern coast of Honshu Island, Japan, both near and far (about 2000 km away) from the epicenter. In the region over the epicenter, 8.7 min after the event, we detected a characteristic signal of the total electron content (TEC) variations consisting of compression and rarefaction phases and a linear transition zone in between, i.e., in the form of an N-type wave with a steep leading front indicating a rapid uplift of the water surface and, correspondingly, the bottom of the ocean. The shape of the signal can be used for early tsunami warning; i.e., it may indicate the tsunamigenic character of a submarine earthquake. We monitored the subsequent evolution of the ionospheric response as far as 2000 km from the epicenter. It was shown that, besides the wellknown ionospheric N-type wave response to the earthquake, there is also a response in the form of an inverted N-wave, both nearby and far from the epicenter. We detected two more types of ionospheric responses far from the epicenter: a solitary-like wave and an internal gravity wave (IGW). The detected signals have been interpreted.  相似文献   

Correlation between large-scale motions in the liquid core of the Earth and geomagnetic jerks,earthquakes, and variations in the Earth’s length of day     

M. B. Gokhberg  E. V. Olshanskaya  O. G. Chkhetiani  S. L. Shalimov  O. M. Barsukov 《Doklady Earth Sciences》2016,467(1):280-283

We consider the correlation between seismicity, variations in the length of day, and geomagnetic jerks. We found that the jerks precede with in-phase variations in the number of strong earthquakes with М > 6.5 and the rate of the length of day in the range of periods of 5–8 years.  相似文献   

Connection between variations of the stress-strain state of the Earth’s crust and seismic activity: The example of Southern California     

Bondur  V. G.  Garagash  I. A.  Gokhberg  M. B.  Lapshin  V. M.  Nechaev  Yu. V. 《Doklady Earth Sciences》2010,430(1):147-150

A three-dimensional geomechanical model of Southern California, including mountain relief, fault tectonics, and characteristic internal borders, such as the roof of the consolidated crust and Moho surface, was created. The initial stress state of the model is determined by the gravitational force and horizontal tectonic movement, established on basis of GPS observations. Monitoring of variations in the stress state of the Earth’s crust and lithosphere, which are generated by seismic processes, has shown that the model enables us to predict an increase of seismic activity in a region and to mark the places in which average earthquakes can occur in the following two weeks.  相似文献   

Deep electromagnetic sounding of the lithosphere in the eastern Baltic (fennoscandian) shield with high-power controlled sources and industrial power transmission lines (FENICS experiment)   总被引：1，自引：0，他引：1  

A. A. Zhamaletdinov  A. N. Shevtsov  T. G. Korotkova  Yu. A. Kopytenko  V. S. Ismagilov  M. S. Petrishev  B. V. Efimov  M. B. Barannik  V. V. Kolobov  P. I. Prokopchuk  M. Yu. Smirnov  S. A. Vagin  M. I. Pertel  E. D. Tereshchenko  A. N. Vasil’ev  V. F. Grigoryev  M. B. Gokhberg  V. I. Trofimchik  Yu. M. Yampolsky  A. V. Koloskov  A. V. Fedorov  T. Korja 《Izvestiya Physics of the Solid Earth》2011,47(1):2-22

The paper addresses the technique and the first results of a unique experiment on the deep tensor frequency electromagnetic sounding, the Fennoscandian Electrical conductivity from results of sounding with Natural and Controlled Sources (FENICS). In the experiment, Energy-1 and Energy-2 generators with power of up to 200 kW and two mutually orthogonal industrial 109- and 120-km-long power transmission lines were used. The sounding frequency range was 0.1–200 Hz. The signals were measured in the Kola-Karelian region, in Finland, on Svalbard, and in Ukraine at distances up to 2150 km from the source. The parameters of electric conductivity in the lithosphere are studied down to depths on the order of 50–70 km. A strong lateral homogeneity (the one-dimensionality) of a geoelectric section of the Earth’s crust is revealed below depths of 10–15 km. At the same time, a region with reduced transverse crustal resistivity spread over about 80 000 square kilometers is identified within the depth interval from 20 to 40 km. On the southeast the contour of the anomaly borders the zone of deepening of the Moho boundary down to 60 km in Central Finland. The results are compared with the AMT-MT sounding data and a geodynamic interpretation of the obtained information is carried out.  相似文献   

The Chelyabinsk meteorite: Ionospheric response based on GPS measurements     

M. B. Gokhberg  E. V. Ol’shanskaya  G. M. Steblov  S. L. Shalimov 《Doklady Earth Sciences》2013,452(1):948-952

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The evolution of the stress state in Southern California based on the geomechanical model and current seismicity     

V. G. Bondur  I. A. Garagash  M. B. Gokhberg  M. V. Rodkin 《Izvestiya Physics of the Solid Earth》2016,52(1):117-128

A three-dimensional geomechanical model of Southern California, which includes the mountain topography, fault tectonics, and main structural boundaries (the top of the lower crust and the Moho), is developed. The main stress state of the model is determined by the own weight of the rocks and by the horizontal tectonic motions identified from the GPS observations. The model enables tracking the changes which occur in the stress-strain state of the crust due to the evolution of the seismic process. As the input data, the model uses the current seismicity and treats each earthquake as a new defect in the Earth’s crust which brings about the redistribution of strains, elastic energy density, and yield stress of the crust. Monitoring the variations in the stress state of the crust and lithosphere arising in response to the seismic process shows that the model is suitable for forecasting the enhancement in seismic activity of the region and delineating the earthquake-prone areas with a reasonable probability on a given time interval.  相似文献