Аннотация
Представлены первые результаты комплексных исследований сильного сейсмического события, произошедшего 20.12.2018 г. в зоне сочленения Курило-Камчатской и Алеутской островных дуг, — землетрясения Углового Поднятия (ЗУП), имевшего магнитуду Mw=7.3. Приведены макросейсмические сведения о ЗУП, выполнены расчеты пиковых ускорений грунта и тензора сейсмического момента, кратко описаны форшоковый и афтершоковый процесс, обобщены данные о предвестниках землетрясения. ЗУП ощущалось на расстояниях до 500 км. Максимальная балльность составила I=5−6 на эпицентральном расстоянии Δ~90 км на о. Беринга, где отмечено максимальное инструментально зарегистрированное ускорение ~60 см/сек2. Показано, что удаленные во времени форшоки произошли за ~2 года до ЗУП. К особенностям длительного и интенсивного афтершокового процесса ЗУП отнесена ярко выраженная группируемость афтершоков в трех пространственно изолированных кластерах, характеризующихся различными параметрами временного хода сейсмичности. Сильнейший афтершок имел магнитуду ML=6.6, еще 25 событий соответствовало ML≥5.0. ЗУП предварялось предвестниковыми аномалиями в параметрах геофизических полей и сейсмического процесса. Получены оценки размеров очага ЗУП, величины очаговой подвижки, длительности разрыва. Тензор сейсмического момента ЗУП обладает большой недипольной составляющей.Библиографические ссылки
Gavrilov V.A., Vlasov Yu.A., Denisenko V.P. i dr. Opyt kompleksnykh skvazhinnykh geofizicheskikh nablyudeny v tselyakh monitoringa sostoyaniya geosredy // Vestnik KRAUNTs. Nauki o Zemle. 2006. № 2. Vyp. 8. S. 44–53 [Gavrilov V.A., Vlasov Yu.A., Denisenko V.P. et al. Experience in integrated borehole geophysical observations to monitor the state of the geological environment // Vestnik KRAUNTs. Nauki o Zemle. 2006. № 2(8). P. 44–53 (in Russian)].
Gavrilov V.A., Morozova Yu.V., Storcheus A.V. Variatsii urovnya geoakusticheskoy emissii v glubokoy skvazhine G-1 (Kamchatka) i ikh svyaz s seysmicheskoy aktivnostyu // Vulkanologiya i seysmologiya. 2006. № 1. S. 52–67 [Gavrilov V.A., Morozova Yu.V., Storcheus A.V. Variations in the Level of Geoacoustic Emission in Deep Well G-l, Kamchatka and Their Relation to Seismicity // Vulkanologiya i sejsmologiya. 2006. № 1. P. 52–67 (in Russian)].
Gnibidenko G.S., Bykova T.G., Veselov O.V. i dr. Tektonika Kurilo-Kamchatskogo glubokovodnogo zheloba. M.: Nauka, 1980. 179 s. [Gnibidenko G.S., Bykova T.G., Veselov O.V. et al. // Tectonics of the Kuril-Kamchatka deep-sea trench, M.: Nauka, 1980. 179 p. (in Russian)].
GOST R 57546–2017. Zemletryaseniya.Shkala seysmicheskoy intensivnosti. M.: Standartinform, 2017 [GOST R 57546–2017. Earthquakes. Seismic intensity scale. M.: Standartinform, 2017 (in Russian)].
Guseva E.M., Gusev A.A., Oskorbin L.S. Paket programm dlya tsifrovoy obrabotki seysmicheskikh zapisey i ego oprobovaniye na materiale nekotorykh zapisey silnykh dvizheny // Vulkanologiya i seysmologiya. 1989. № 1. S. 35–49 [Guseva E.M., Gusev A.A., Oskorbin L.S. A program package for digital processing ofseismic records and its application to some sample records of strong ground motion // Journal of Volcanology and Seismology. 1991. V. 11. № 5. P. 648–670].
Droznin D.V., Chebrov D.V., Droznina S.Ya. i dr. Avtomatizirovannaya otsenka intensivnosti seysmicheskikh sotryaseny po instrumentalnym dannym v rezhime kvazirealnogo vremeni i ee ispolzovaniye v ramkakh sluzhby srochnykh seysmicheskikh doneseny na Kamchatke // Seysmicheskiye pribory. 2017. № 3. S. 5–19. https://doi.org/10.21455/ si2017.3-1 [Droznin D.V., Chebrov D.V., Droznina S.Ya. et al. Automated Estimation of Seismic Shaking Intensity from Instrumental Data in Quasi-Real-time Mode and Its Use in the Operation of the of Seismic Early Warning Service in the Kamchatka Region // Seismic Instruments. 2018. V. 54. Iss. 3. P. 239–246. https://doi.org/10.3103/S0747923918030088].
Zavyalov A.D. Srednesrochny prognoz zemletryaseny: osnovy, metodika, realizatsii. M.: Nauka, 2006. 254 s. [Zavyalov A.D. Mid-term earthquake forecast: fundamentals, methodology, implementation. M.: Nauka, 2006. 254 p. (in Russian)].
Zemletryaseniya Rossii v 2016 godu / Gl. red. A.A, Malovichko. Obninsk: FITs EGS RAN, 2018. 212 s. [ The earthquakes of Russia in 2016 / Ed. A.A. Malovichko. Obninsk: GS RAS, 2018. 212 p.].
Pavlov V.M., Abubakirov I.R. Algoritm rascheta tenzora seysmicheskogo momenta silnykh zemletryaseny po regionalnym shirokopolosnym seysmogrammam obyemnykh voln // Vestnik KRAUNTs. Nauki o Zemle. 2012. № 2. Vyp. 20. S. 149–158 [Pavlov V.M., Abubakirov I.R. Algorithm for Calculation of Seismic Moment Tensor of Strong Earthquakes Using Regional Broadband Seismograms of Body Waves // Vestnik KRAUNTs. Nauki o Zemle. 2012. № 2(20). P. 149–158 (in Russian)]
Pavlov V.M., Abubakirov I.R. Raschet tenzora seysmicheskogo momenta slabykh kamchatskikh zemletryaseny: pervyye rezultaty // Problemy kompleksnogo geofizicheskogo monitoringa Dalnego Vostoka Rossii. Trudy shestoy nauchno-tekhnicheskoy konferentsii. Petropavlovsk-Kamchatsky. 1–7 oktyabrya 2017 g. Obninsk: FITs EGS RAN, 2017. S. 138−142 [Pavlov V.M., Abubakirov I.R. Calculation of seismic moment tensor for weak Kamchatka earthquakes: first results // Problems of complex geophysical monitoring of Far East of Russia. Proceedings of VI science conference. PetropavlovskKamchatsky. September, 1–7. 2017. Obninsk: GS RAS, 2017. P. 138–142 (in Russian)].
Saltykov V.A. O vozmozhnykh problemakh otsenki prostranstvenno-vremennykh osobennostey predstavitelnosti kataloga zemletryaseny (na primere Kamchatskogo kataloga Edinoy geofizicheskoy sluzhby RAN) // Vestnik KRAUNTs. Nauki o Zemle. 2019. Vyp. 43. № 3. S. 25–35 [Saltykov V.A. On possible problems of assessing the spatio-temporal features of the completeness of the earthquake catalog (on the example of the Kamchatka catalog of the Geophysical Service of RAS) // Vestnik KRAUNTs. Nauki o Zemle. 2019. № 3(43). P. 25–35 (in Russian)].
Saltykov V.A., Kugayenko Yu.A., Kravchenko N.M., Konovalova A.A. Parametricheskoye predstavleniye dinamiki seysmichnosti Kamchatki // Vulkanologiya i seysmologiya. 2013. № 1. S. 65–84 [Saltykov V.A., Kugaenko Yu.A.. Kravchenko N. M., Konovalova A.A. Parametric Representation of Kamchatka Seismicity over Time. Journal of Volcanology and Seismology. 2013. V. 7. № 1. P. 58–75. https://doi.org/10.1134%2FS0742046313010065].
Slavina L.B., Myachkin V.V., Belyankin G.A. Zakonomernosti proyavleniya vo vremeni i prostranstve kinematicheskikh predvestnikov zemletryaseny // Postroyeniye modeley razvitiya seysmicheskogo protsessa i predvestnikov zemletryaseny. 1993. № 1. S. 131–138 [Slavina L.B., Myachkin V.V., Belyankin G.A. Patterns of manifestation in time and space of kinematic precursors of earthquakes // Construction of models for the development of the seismic process and precursors of earthquakes. 1993. № 1. P. 131–138 (in Russian)].
Slavina L.B., Myachkin V.V., Levina V.I. Opyt primeneniya kinematicheskikh predvestnikov seysmicheskogo polya dlya prognozov zemletryaseny na Kamchatke // Kompleksnyye seysmologicheskiye i geofizicheskiye issledovaniya Kamchatki. Petropavlovsk-Kamchatsky: Kamchatsky pechatny dvor, 2004. S. 216–227 [Slavina L.B., Myachkin V.V., Levina V.I. The experience of using kinematic precursors of the seismic field for earthquake forecasts in Kamchatka // Integrated seismological and geophysical studies of Kamchatka. Petropavlovsk-Kamchatsky: Kamchatskij pechatnyj dvor, 2004. P. 216–227 (in Russian)].
Sobolev G.A., Tyupkin Yu.S., Smirnov V.B., Zavyalov A.D. Sposob srednesrochnogo prognoza zemletryaseny // DAN. 1996. T. 347. № 3. S. 405–407 [Sobolev G.A., Tyupkin Yu.S., Smirnov V.B., Zavialov A.D. The method of medium-term earthquake forecast // Doklady Earth Sciences. 1996. V. 347. № 3. P. 405–407].
Fedotov S.A. Energeticheskaya klassifikatsiya Kurilo-Kamchatskikh zemletryaseny i problema magnitud. M.: Nauka, 1972. 117 s. [Fedotov S.A. Energy classification of the Kuril-Kamchatka earthquakes and the problem of magnitudes. M.: Nauka, 1972. 117 p. (in Russian)].
Firstov P.P., Rudakov V.P. Rezultaty registratsii podpochvennogo radona v 1997-2000 gg. na Petropavlovsk-Kamchatskom geodinamicheskom poligone // Vulkanologiya i seysmologiya. 2003. № 1. S. 26–41 [Firstov P.P., Rudakov V.P. The results of the registration of subsoil radon in 1997-2000 at the Petropavlovsk-Kamchatka geodynamic test site // Volcanology i seismology. 2003. № 1. P. 26–41 (in Russian)].
Firstov P.P., Shirokov V.A., Rulenko O.P. i dr. O svyazi dinamiki podpochvennogo radona (222Rn) i vodoroda s seysmicheskoy aktivnostyu Kamchatki v iyule-avguste 2004 g. // Vulkanologiya i seysmologiya. 2006. № 5. S. 49–59 [Firstov P.P., Shirokov V.A., Rulenko O.P. et al. On the relationship between the dynamics of subsoil radon (222Rn) and hydrogen with the seismic activity of Kamchatka in July-August 2004 // Volcanology i Seismology. 2006. № 5. P. 49–59 (in Russian)].
Chebrov V.N., Droznin D.V., Kugayenko Yu.A. i dr. Sistema detalnykh seysmologicheskikh nablyudeny na Kamchatke v 2011 g. // Vulkanologiya i seysmologiya. 2013. № 1. S. 18–40 [Chebrov, V.N., Droznin D.V., Kugaenko Yu.A. et al. The system of detailed seismological observations in Kamchatka in 2011 // Journal of Volcanology and Seismology. 2013. V. 7. № 1. P. 16–36. https://doi.org/10.1134/S0742046313010028].
Chebrov D.V., Kugayenko Yu.A., Lander A.V. i dr. Blizhne-Aleutskoye zemletryaseniye 17.07.2017 G. s Mw=7.8. I. Protyazhenny razryv vdol Komandorskogo bloka Aleutskoy ostrovnoy dugi po dannym nablyudeny na Kamchatke // Fizika Zemli. 2019. № 4. S. 48–71. https://doi.org/10.31857/S0002-33372019448-71 [Chebrov D.V., Kugaenko Yu.A., Lander A.V. et al. Near Islands Aleutian Earthquake with Mw=7.8 on July 17, 2017: I. Extended Rupture along the Commander Block of the Aleutian Island Arc from Observations in Kamchatka // Izvestiya, Physics of the Solid Earth. 2019. V. 55. № 4. P. 576–599. https://doi.org/10.1134/S1069351319040037].
Bath M. Lateral inhomogeneities of the upper mantle // Tectonophysics. 1965. V. 2. № 6. P. 483–514.
Ekstrom G., Nettles M., Dziewonski A.M. The global CMT project 2004–2010: Centroid-moment tensors for 13,017 earthquakes // Physics of the Earth and Planetary Interiors. 2012. V. 200–20. P. 1–9. https://doi.org/10.1016/j.pepi.2012.04.002.
Henry C., Woodhouse J.H., Das S. Stability of earthquake moment tensor inversion: effect of the double-couple constraint // Tectonophysics. 2002. V. 356. Iss. 1. P. 115–124. https://doi.org/10.1016/S0040-1951(02)00379-7.
Kennett B., Engdah E.R., Buland R. Constraints on seismic velocities in the Earth from traveltimes // Geophysical Journal Internation, 1995. V. 122. P. 108–124.
Okada Y. Surface deformation due to shear and tensile faults in a half-space // BSSA. 1985. V. 75. № 4. P. 1135–1154.
Wyss M., Habermann R.E. Seismic quiescence precursory to a past and a future Kurile island earthquake // Pure and Applied Geophysics. 1979. V. 117. Iss. 6. P. 1195–1211. https://doi.org/10.1007/bf00876215.
Контент доступен под лицензией Creative Commons Attribution-NonCommercial 4.0 International License.