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Diagnosing Source Geometrical Complexity of Large Earthquakes

机译:诊断大地震的震源几何复杂度

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We investigated the possible frequency dependence of the moment tensor of large earthquakes by performing W phase inversions using teleseismic data and equally-spaced narrow, overlapping frequency bands. We investigated frequencies from 0.6 to 3.8 mHz. Our focus was on the variation with frequency of the scalar moment, the amount of non-double-couple, and the focal mechanism. We applied this technique to 30 major events in the period 1994-2013 and used the results to detect source complexity. Based on the results, we classed them into three groups according to the variability of the source parameters with frequency: simple, complex and intermediate. Twelve of these events fell into the simple category: Bolivia-1994, Kuril-1994, Sanriku-1994, Antofagasta- 1995, Andreanoff-1996, Peru-2001, Sumatra-2004, Sumatra-2005, Tonga-2006, Sumatra-2007, Japan-2011, and the recent Sea of Okhotsk-2013. Seven exhibited significant complexity: Balleny-1998, Sumatra-2000, Indian Ocean-2000, Macquarie Island-2004, Sichuan-2008, and Samoa-2009. The remaining 11 events showed a moderate degree of complexity. Here, we discuss the results of this study in light of independent observations of source complexity, made by various investigators.
机译:我们通过使用远震数据和等距的窄重叠频段进行W相反转研究了大地震矩张量的可能频率依赖性。我们研究了0.6到3.8 mHz的频率。我们关注的是标量矩频率,非双耦合量和聚焦机制随频率的变化。我们将此技术应用于1994-2013年期间的30个重大事件,并使用结果来检测源复杂性。根据结果​​,我们根据源参数随频率的变化将它们分为三类:简单,复杂和中间。这些事件中有十二个属于简单事件:玻利维亚-1994年,千岛-1994年,桑里库-1994年,安托法加斯塔-1995年,安德烈亚诺夫-1996年,秘鲁-2001年,苏门答腊-2004年,苏门答腊-2005年,汤加-2006年,苏门答腊-2007年,日本2011年,以及最近的鄂霍次克海2013年。有七个展览展示了显着的复杂性:Balleny-1998,Sumatra-2000,Indian Ocean-2000,Macquarie Island-2004,Schuan-2008和Samoa-2009。其余11个事件显示出中等程度的复杂性。在这里,我们根据不同研究者对源复杂性的独立观察来讨论本研究的结果。

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