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The 1922 Peninsula Malaysia Earthquakes: Rare Intraplate Seismicity within the Sundaland Block in Southeast Asia

机译：1922年半岛马来西亚地震：东南亚孙达兰街区内的罕见血液膜地震性

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摘要

Seismic hazard in the southern Malay Peninsula located within the Sundaland block in Southeast Asia is poorly understood. The paucity of historical earthquakes and low‐magnitude instrumented seismicity has led to the assumption that this region is largely aseismic. We question this point of view by reassessing historical seismicity in this region and, in particular, a pair of moderate earthquakes in the 1920s. The first of these struck on 31 January 1922 at ≈9:10??a.m. local time (LT) for which we estimate an intensity magnitude (?MI?) ≈5.4?, and for the second earthquake on 7 February 1922 at ≈12:15??p.m. LT, we estimate MI≈5.0?. We also identify at least 34 felt earthquakes between 1803 and 1950 that were potentially local within the Sundaland block. These include a very widely felt shock (or set of shocks) on 26 June 1874 that was felt in parts of Borneo, Java, and Sumatra. The discovery of these earthquakes challenges the tectonic stability of the Malay Peninsula and the stable interior of the Sundaland block. The record of historical seismicity in this region relies heavily on European sources, and we recommend locating and consulting indigenous sources to improve the current understanding of regional seismic hazard. We also underscore the need to evaluate the impact of ground motions from rare local earthquakes on the extant building stock and on transportation infrastructure that are otherwise relatively immune to the long‐period effects of distant earthquakes commonly felt in the Malay Peninsula.
机译：None

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  • 来源
    《Seismological research letters》 |2020年第5期|共15页
  • 作者

    Stacey Servito Martin; Yu Wang; Muzli Muzli; Shengji Wei;

  • 作者单位

    Research School of Earth Sciences (RSES) Australian National University (ANU);

    Department of Geosciences National Taiwan University;

    Indonesian Meteorological Climatological &

    Geophysical Agency (BMKG);

    Earth Observatory of Singapore (EOS) Nanyang Technological University (NTU);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地震学;
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