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First observation of microspherule from the infratrappean Gondwana sediments below killari region of Deccan LIP,Maharashtra(India) and possible implications

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Geoscience Frontiers 2019年第6期10卷 2281-2285页

作者： G.Parthasarathy O.P.PANDey B.Sreedhar Mukund Sharma Priyanka Tripathi Nimisha Vedanti CSIR-National Geophysical Research Institute Hyderabad500007India National Institute of Advance Studies School of Natural Sciences and EngineeringIndian Institute of Science CampusBengaluru560012India CSIR-Indian Institute of Chemical Technology Hyderabad500007India Birbal Sahni Institute of Palaeosciences 53 University RoadLucknow226007India Presently at Banaras Hindu University VaranasiIndia Geological Survey of India BandalagudaHyderabad50068India

A rare occurrence of a microspherule has been found in the infratrappean sediments,encountered below338 m thick Deccan volcanic cover in KLR-1 scientific borehole,drilled in the epicentral zone of the 1993 killari earthquake(Maharashtra,India).Palynological studies of the sediments indicate their age as Early Permian(Asselian,298-295 Ma) for *** electron microscope studies reveal that the spherule from the infratrappeans,is having a similar composition to that of the Neoarchean amphibolite to granulite facies mid crustal *** spherule is non-spherical in nature,containing mostly FeO(10.70±0.20 wt.%),CaO(13.8±0.5 wt.%),Al203(7.78±0.30 wt.%),MgO(6.47±0.3 wt.%),Si02(47,46±0.50 wt.%),Ti02(2.47±0.3 wt.%).K20(1.89±0.20 wt.%).and Cl(0.33±0.05 wt.%).Since the Fe composition of the spherule is almost same as the basement rock(10.5 wt.%),and the chlorine content is also in the same range as the basement(0.04-0.24 wt.%),it would suggest possibility of an extraterrestrial impact over the Indian terrain during the erstwhile Gondwana sedimentation period that may be associated with the Permian-Triassic mass extinction,the most severe one in the Earth's history.

关键词： Deccan trap killari borehole Microspherules Condwana sediments Tectonics P-T impact

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国家地震局专家组赴印考察killari地震

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世界地震工程 1994年第1期 47-47页

作者：张敏政

1993年9月30日,在印度西南部MAHARASHTRA邦、ANDHRA邦和KARNATAKA邦交界处附近,发生了M6.4级地震。仪器测定的震中位置为18.2°N、76.7°E,宏观震中在MAHARASH-TRA邦killari镇西南约5公里处。此次地震震中烈度Ⅷ度(MMI),极震区内十个村... 详细信息

1993年9月30日,在印度西南部MAHARASHTRA邦、ANDHRA邦和KARNATAKA邦交界处附近,发生了M6.4级地震。仪器测定的震中位置为18.2°N、76.7°E,宏观震中在MAHARASH-TRA邦killari镇西南约5公里处。此次地震震中烈度Ⅷ度(MMI),极震区内十个村镇被毁,死亡和失踪者约三万人。

关键词：地震极震区印度 killari 水库南亚地震科学研究国家地震局专家组

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Stochastic earthquake source model for ground motion simulation

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Earthquake Engineering and Engineering Vibration 2019年第1期18卷 1-34页

作者： P.R.Lekshmy S.T.G.Raghukanth Department of Civil Engineering

In the analysis and design of important structures with relatively long life spans, there is a need to generate strong motion data for possible large events. The source of an earthquake is characterized by the spatial distribution of slip on the fault plane. For future events, this is unknown. In this paper, a stochastic earthquake source model is developed to address this issue. Here, 1D and 2D stochastic models for slip distribution developed by Lavallée et al.(2006) are used. The random field associated with the slip distribution is heavy-tailed stable distribution which can be used for large events. Using 236 past rupture models, the spectral scaling parameter and the four stable or Levy's parameters against empirical relationship for known quantities like magnitude or fault length are developed. The model is validated with data from 411 stations of 1999 Chi-Chi earthquake. The simulated response spectrum showed good agreement to actual data. Further the proposed model is used to generate ground motion for the 1993 killari Earthquake where strong motion data is not available. The simulated mean peak ground velocity was in turn related to the intensity(MSK) and compared against values in the literature.

关键词： stochastic slip distribution ground motion Levy’s parameters killari earthquake

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