检索结果-南通市图书馆

Three-dimensional Q structure in Jiashi earthquake region of Xinjiang

Acta Seismologica Sinica(English Edition) 2001年第6期14卷 611-619页

作者：樊计昌李松林赖晓玲邓宏钊 1. Research Center of Exploration Geophysics China Seismological Bureau 450002 Zhengzhou China

3-D S-wave Q structure in Jiashi earthquake region is inverted based on the attenuation of seismic waves recorded from earthquakes in this region in 1998 by the Research Center of Exploration Geophysics (RCEG), CSB, and a rough configuration of deep crustal faults in the earthquake region is presented. First, amplitude spectra of S-waves are extracted from 450 carefully-chosen earthquake records, called observed amplitude spectra. Then, after instrumental and site effect correction, theoretical amplitude spectra are made to fit observed amplitude spectra with nonlinear damped least-squares method to get the observed travel time over Q, provided that earthquake sources conform to Brune's disk dislocation model. Finally, by 3-D ray tracing method, theoretical travel time over Q is made to fit observed travel time over Q with nonlinear damped least-squares method. In the course of fitting, the velocity model, which is obtained by 3-D travel time tomography, remains unchanged, while only Q model is modified. When fitting came to the given accuracy, the ultimate Q model is obtained. The result shows that an NE-trending low Q zone exists at the depths of 10-18 km, and an NW-trending low Q zone exists at the depths of 12-18 km. These roughly coincide with the NE-trending and the NW-trending low velocity zones revealed by other scientists. The difference is that the low Q zones have a wider range than the low velocity zones.

关键词： D Q structure seismic wave attenuation deep fault spectral analysis

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Multisphere Tectonics of the Earth System

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Acta Geologica Sinica(English Edition) 2022年第3期96卷 727-741页

作者： REN Jishun NIU Baogui XU Qinqin ZHAO Lei LIU Jianhui LI Shan ZHU Junbin LIU Renyan Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The fundamental theoretical framework of the Multisphere Tectonics of the Earth System is as follows:(1)It intends to extend the geotectonic studies from the crustal and lithospheric tectonics to the multisphere tectonics of the Ear th system as a whole.(2)The global dynamics driven by both the Earth system and the cosmic celestial system:solar energy,multispheric interactions of the Earth system and the combined effects of the motions of celestial bodies in the cosmos syste m are the driving forces of various geological processes.(3)The Continent-Ocean transformation theory:the continent and ocean are two opposite yet unified geological units,which can be transformed into each other;neither continent nor ocean wi ll survive forever;there is no one-way development of continental accretion or ocean extinction;the simple theory of one-way continental accretion is regarded as invalid.(4)The continental crust and mantle are characterized by multiple layers,with different layers liable to slide along the interfaces between them,but corroboration is needed that continents move as a who le or even drift freely.(5)The cyclic evolution theory:the development of Earth’s tectonics is not a uniform change,but a spiral forward evolution,characterized by a combination of non-uniform,non-linear,gradual and catastrophic changes;different evolutionary stages(tectonic cycles)of Earth have distinctive global tectonic patterns and characteristics,one tectonic mo del should not be applied to different tectonic cycles or evolutionary stages.(6)The structure and evolution of Earth are asymmetric and heterogeneous,thus one tectonic model cannot be applied to different areas of the world.(7)The polycyclic evolution of the continental crust:the continental crust is formed by polycyclic tectonics and magmatism,rather than simply lateral or vertical accretion.(8)The role of deep faults:the deep fault zones cutting through different layers of the crus t a nd mantle usually play important roles

关键词： deep fault global dynamics cyclic evolution theory Multisphere Tectonics Continent-Ocean transformation theory Earth system science

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