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Glubokofokusnyye zemletryaseniya; prostranstvennoye raspredeleniye, vozmozhnyye prichiny i geodinamicheskiye sledstviya [Deep-focus earthquakes; spatial patterns, possible causes and geodynamic consequences]
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|Alternate Title:||Deep-focus earthquakes; spatial patterns, possible causes and geodynamic consequences|
|Authors:||Didenko, Aleksey Nikolayevich; Kuz'min, Mikhail Ivanovich|
|Author Affiliations:||Primary: |
Rossiyskaya Akademiya Nauk, DVO, Institut Tektoniki i Geofiziki im. Yu. A. Kosygina, Khabarovsk, Russian Federation
|Volume Title:||Geodinamika i Tektonofizika Geodynamics & Tectonophysics|
|Source:||Geodinamika i Tektonofizika = Geodynamics & Tectonophysics, 9(3), p.947-965. Publisher: Institut Zemnoy Kory Sibirskogo Otdeleniya Rossiyskoy Akademii Nauk, Irkutsk, Russian Federation. ISSN: 2078-502X|
|Note:||In Russian with English summary. 42 refs.|
|Summary:||The spatial analysis was conducted to analyze the positions of earthquakes hypocenters in the transit zone of the upper mantle and the focal mechanisms of the strongest earthquakes in the subduction slabs of the Okhotsk Sea segment of the Kuril-Kamchatka island arc and the Japan Sea segment of the Japanese island arc. It revealed a significant difference in the morphology of these slabs, as well as in the positions of the earthquake hypocenters relative to the active and stagnating parts of the slabs and the forces that caused the earthquakes. Based on the seismic data presented in the article, it is confirmed that there are two types of subduction of the oceanic lithospheric plates in the mantle. The article discusses relationships between the subduction and various geological processes at the upper-lower mantle boundary. It considers possible causes (including those related to phase transitions) of deep-focus earthquakes, in case of which splitting of the oceanic lithospheric plates takes place at depths near the upper-lower mantle boundary. Subduction of the oceanic lithospheric plates and their splitting predetermine a possibility for the crustal elements to penetrate into the lower mantle and deeper into the D° layer, wherein new plumes arise and transport the deep magma together with the recycled substance into the crust. Deep-focus earthquakes are a necessary link in the mechanism providing for the recycling of chemical elements in the crust - mantle - D° layer system and thus leading to the formation of a wide range of mineral deposits.|
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