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Publications (45)
The seismicity review of Kamchatka and surrounding territories for 2016–2017 is given. In the Kamchatka earthquake catalogue, the minimum local magnitude of completeness is MLmin=4.0, and for earth-quakes with h≥350 km under the Okhotsk sea MLmin=4.3. The Kamchatka catalogue of earthquakes with ML=3.6–7.3 for 2016–2017, published in the Appendix to...
The seismicity review of Kamchatka and surrounding territories for 2015 is given. In the Kamchatka earthquake catalogue, the minimum local magnitude of completeness is MLmin=3.5, and for earthquakes with h≥350 km under the Okhotsk sea MLmin=3.6. The Kamchatka earthquake catalogue for 2015 with ML3.5, published in the Appendix to this issue, includ...
The digital seismic network in Kamchatka deployed in 2006–2010 provided a fundamental possibility for calculating seismic moment tensor (SMT) of Kamchatka earthquakes from broadband waveforms recorded by regional stations. The paper describes the method for calculating SMT for the earthquakes with pure double couple (DC) mechanism based on the DC t...
The digital seismic network in Kamchatka deployed in 2006-2010 provided a fundamental possibility for calculating seismic moment tensor (SMT) of Kamchatka earthquakes from broadband waveforms recorded by regional stations. The paper describes the method for calculating SMT for the earthquakes with pure double couple (DC) mechanism based on the DC t...
—The Udina volcanic complex located in the southeastern part of the Klyuchevskoy group of volcanoes in Kamchatka remained dormant for several thousand years, but the magmatic system beneath the area may be awakening judging by seismic unrest. Seismicity in the area is characterized by data from permanent regional seismic stations and campaign local...
Развернутая в 2006–2010 гг. на Камчатке сеть цифровых сейсмических приборов создала принципиальную возможность для расчета тензора сейсмического момента (ТСМ) камчатских землетрясений по широкополосным волновым формам региональных станций. В статье описана методика расчета ТСМ типа двойной диполь без момента (ДД), опирающаяся на декомпозицию тензор...
The digital seismic network in Kamchatka deployed in 2006-2010 provided a fundamental possibility for calculating seismic moment tensor (SMT) of Kamchatka earthquakes from broadband waveforms recorded by regional stations. The paper describes the method for calculating SMT for the earthquakes with pure double couple (DC) mechanism based on the DC t...
The seismicity review of Kamchatka and surrounding territories for 2014 is given. In Kamchatka earthquake catalogue minimum local magnitude of completeness is MLmin=3.5, and for earthquakes under the Okhotsk sea with h≥350 kmMLmin=3.6. The Kamchatka earthquake catalogue for 2014 with ML3.5, published in the Appendix to this annual, includes 1114 e...
The paper presents the first results of integrated research of the strong seismic event (Uglovoye Podnyatiye earthquake (UPE) with a magnitude of Mw=7.3) that occurred on December 20, 2018 in the junction zone between the Kuril-Kamchatka and Aleutian island arcs. The authors has provided macroseismic information about the UPE, calculated peak groun...
The February 28, 2013 earthquake (MwGCMT=6.8), which occurred on the southeast coast of Kamchatka, is discussed. The instrumental hypocenter location reported by the KB GS RAS is φ=50.67N, λ=157.77E, h=61 km. Three magnitudes were obtained: local magnitude ML=6.9, code-wave magnitude Mc=6.6, mo-ment magnitude Mw=6.7. The focal mechanisms of the F...
The strong (Mwreg=5.8, ML=6.2) near-surface seismic event (Ilpyrskoye earthquake) occurred at 03h12m on 13 March, in the Kamchatka Isthmus. It was the strongest earthquake between 1962 and 2013 for this area. The greatest macroseismic effect was observed at a distance of ~30 km, I=6–7 on the scale MSK-64. We used two independent methods for determi...
17 июля 2017 г. на трансформном разломе Беринга (на границе малой литосферной плиты Берингии и Командорского блока Алеутской островной дуги) произошло сильнейшее в регионе за годы инструментальных сейсмологических наблюдений задуговое землетрясение с MW =7.8, MC=8.2, названное Ближне-Алеутским. Оно вызвало сотрясения с интенсивностью I=5-6 баллов н...
The largest instrumentally recorded regional back-arc earthquake with MW = 7.8, MC = 8.2 occurred on July 17, 2017 on the Bering transform fault (the boundary between the Beringia minor lithospheric plate and the Komandorskii (Commander) block of the Aleutian island arc). This seismic event, called the Near Islands earthquake or Near Islands Aleuti...
The strong MW 6 .7 e arthquake occurred on
October 13, 2018 at 11:10 UTC (23:10 local time) in
the Sea of Okhotsk at a depth of ~500 km. According
to the Kamchatka Branch of Geophysical Survey of
the Russian Academy of Sciences (KB GS RAS), the
epicenter of the earthquake was located ≈320 km to
west of Petropavlovsk-Kamchatsky and ≈160 km from
the...
The average relationship is established between the basic magnitude for the Kamchatka regional catalog, ML, and modern moment magnitude Mw. The latter is firmly tied to the value of the source seismic moment M0 which has a direct physical meaning. ML magnitude is not self-reliant but is obtained through the conversion of the traditional Fedotov’s S...
This paper reports a study of the Tolud earthquake sequence; the sequence was a burst of shallow seismicity between November 28 and December 7, 2012; it accompanied the initial phase in the Tolbachik Fissure Eruption of 2012‒2013. The largest earthquake (the Tolud earthquake of November 30, 2012, to be referred to as the Tolud Earthquake in what fo...
17 июля 2017 г. в 23:34 по Гринвичу (18 июля в 11:34 по местном времени) в Командорском сегменте Алеутской островной дуги произошло сильное землетрясение с магнитудой MW = 7.8 (широта 54.35 с.ш., долгота 168.90 в.д., глубина 7 км). Эпицентр землетрясения находился в 200 км к юго-востоку от пос. Никольское (рисунок), расположенного на о. Беринга,...
The problem of calculating complete synthetic seismograms from a point dipole with an arbitrary seismic moment tensor in a plane parallel medium composed of homogeneous elastic isotropic layers is considered. It is established that the solutions of the system of ordinary differential equations for the motion–stress vector have a reciprocity propert...
29.03.2017 г. у восточного побережья Камчатки в юго-западной части Корякского сейсмического пояса произошло редкое для этой зоны сильное, но не вызвавшее разрушений и цунами, землетрясение с магнитудой МW = 6.6.
Гипоцентр находился под акваторией залива Озерного, в южной его части, поэтому это сейсмическое событие было названо Южно-Озерновским земл...
Foreign tsunami warning centers successfully use the Mwp magnitude for the fast characterization of tsunamigenic potential of an earthquake. This magnitude is an estimate of the moment magnitude Mw based on broadband P-wave records. The development of regional Mwp scale for the Russian Far East region is suitable, but the current sparsity of the fa...
30.01.2016 г. в Северной части Камчатской сейсмофокальной зоны на глубине 178 км произошло сильное, не вызвавшее разрушений землетрясение с магнитудой МW = 7.2, ощущавшееся на территории Камчатского края с интенсивностью до 6 баллов по шкале MSK-64 и получившее название «Жупановское землетрясение» в соответствии с географическим положением его эпиц...
The seismic moment tensor (SMT) was computed for the source of the deep-focus Sea of Okhotsk earthquake of May 24, 2013 (M
w
= 8.3) based on two kinds of regional data: (1) coseismic displacements at GNNS stations; and (2) three-component broadband seismograms (in this case we also estimated the depth of the equivalent point source and rupture dura...
A new algorithm is proposed for calculating the complete synthetic seismograms from a point source in the form of the sum of a single force and a dipole with an arbitrary seismic moment tensor in a plane layered medium composed of homogenous elastic isotropic layers. Following the idea of (Alekseev and Mikhailenko, 1978), an artificial cylindrical...
The article presents an algorithm for estimation of integral parameters of a strong earthquake focus (Mw > 8) using broadband seismograms of body waves recorded within the range of epicentral distances from 500 to 3500 km. Besides, depth, duration, and seismic moment tensor were determined and estimated by means of minimization of relative sum of s...
This paper presents results from an analysis of GPS observations made by the Kamchatka regional GPS network (KAMNET) in relation
to the Olyutorskii earthquake and plate interaction. The coseismic changes were interpreted for the Olyutorskii earthquake
and its largest aftershock (May 22, 2006, M
W
= 6.6) within the framework of a dislocation source...
Для оценки параметров очага Олюторского землетрясения (MW = 7.6) применен подход, основанный на использовании пространственно-временных моментов скорости подвижки порядков 1 и 2. Моменты оценивались с использованием широкополосных записей P-волн по данным 52 станций мировой сети. Сначала для каждой станции определяется функция S(t) кажущаяся врем...
The source parameters of the M
W
= 7.6 Olyutorskii earthquake were estimated using the moments of the slip rate function with degrees 1 and 2. The moments
were estimated from broadband P-wave records at 52 stations of the worldwide network. The first step was to find a function S(t) for each station; this function is an apparent source time functio...
A new method is proposed for calculating synthetic seismograms caused by a force in a plane-parallel medium consisting of
homogeneous elastic isotropic layers. The matrix impedance, i.e., the matrix function of depth, by which motion vector must
be multiplied in order to obtain the stress vector, is introduced for solving a system of ordinary diffe...
Based on the example of the strong earthquake of November 24, 1971, with the earthquake source near the Petropavlovsk-Kamchatskii,
the new modeling technique of the strong ground motions within the broadband is tested. In this technique, the seismologically-substantiated
models of the radiation source and elastic medium are used. The source is repr...
A kinematic, stochastic fault model and simulation procedure is proposed for realistic, application-oriented simulation of earthquake ground motion. An extended fault plane is discretized as a grid of point subsources. Subsource signal, in its low-frequency part, is produced by a dislocation strip sweeping the fault area. In its high-frequency part...
The results of studying the process of underthrusting in the Pacific plate under Kamchatka are presented, and the phenomena
associated with this process are described. The seismic component of the velocity of the plate underthrust is estimated on
the basis of (1) data from the CMT (Centroid Moment Tensor) catalog and (2) the sequence of the stronge...
We estimated longer-period (period T>0.5 s) components of the ground motion at the piers of the planned Messina straits bridge. As the shortest fault-to-site distance is only 3-5 km, the kinematic earthquake rupture process has to be described in a realistic way and thus, the causative fault is represented by a dense grid of subfaults. To model the...
In a companion paper (Pavlov 1994) we demonstrated and examined non-uniqueness of the inverse problem for a 3-D seismic source of indigenous type in terms of equivalent force fi(x, t). In this paper we study the non-uniqueness of the inverse problem in terms of polynomial moments (PM) with respect to spatial and temporal variables of both the rate...
The Pacific plate moves toward the Euroasia plate at an average velocity of about 8 cm/year. This movement consists of the deformation connected with subduction zone earthquakes and with slow deformation that can be the result of both creep on the plate border and of viscous relaxation in the upper mantle. In order to know the role of slow deformat...
Since 1996, a network of nine permanent GPS receivers has been recording, in continuous mode, the deformation on Kamchatka peninsula. The velocity and direction of the relative displacement of observation points are estimated from the entire data set for 1996–2000. The deformation related to the large Kronotskoe earthquake (Mw = 7.8, 1997 December...
The inverse problem of the earthquake-source theory is considered. It is shown that for a seismic source of general type distributed over a 3-D spatial region in infinite homogeneous isotropic elastic medium the problem has no unique solution not only in terms of moment density tensor (Backus & Mulcahy 1976a,b), but also in terms of equivalent forc...
We consider an inverse problem of determination of short-period (high-frequency) radiator in an extended earthquake source. This radiator is assumed to be noncoherent (i.e., random), it can be described by its power flux or brightness (which depends on time and location over the extended source). To decide about this radiator we try to use temporal...
For a planar shear earthquake source with monotonous slip at a given point, power moments of the slip rate function provide a useful means of reconstructing a space-time source structure. In theory, even a smoothed source function can be uniformly estimated. Power moments are linear functions of the processed data.We have developed a practical tech...
1 st order in depth variable. A new method for solving these equations is proposed based on introducing of impedance functions. For a given depth an impedance is a matrix H such that a motion vector multiplied by H gives the corresponding stress vector. For the SH case the impedance is a scalar whereas for the P/SV case it is 2x2 matrix one. Explic...
