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Tom La Touche and the great Assam earthquake of 12 June 1897: Letters from the epicenter

机译:汤姆·拉·Touche和1897年6月12日的阿萨姆邦大地震:震中来信

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摘要

Richard Dixon Oldham's classic memoir on the great M = 8.1Assam earthquake of 1897 is seminal for its seismological obser-vations, insights, and conclusions (Oldham 1899). Teleseismicarrivals of waves from Shillong led Oldham (1858-1936) todistinguish the three types of seismic waves and eventually torecognize from them the distinctive presence of the Earth'score. Oldham, however, did not feel the earthquake. He hadleft the Calcutta office of the Geological Survey of India (GSI)in the care of his colleague Thomas Henry Digges La Touche(1856-1938) two weeks previously (see figure 1). Now recentlydiscovered letters written by La Touche from Calcutta and theepicentral region to his wife, Nancy, provide a firsthand, day-by-day account of the post-earthquake investigation and include aseismogram from an instrument that he constructed in the fieldat a cost of "less than sixpence" from pieces of tin, a suspendedboulder, a glass bead, and a bamboo needle that scratched aglass plate (LaTouche papers, 1880-1913).
机译:理查德·迪克森·奥尔德汉姆(Richard Dixon Oldham)关于1897年阿萨姆邦8.1级大地震的经典回忆录因其对地震的观察,见解和结论而具有开创性(奥尔德姆1899年)。西隆的电波的来临地震导致奥尔德姆(Oldham)(1858-1936)区分了三种类型的地震波,并最终从中辨别出地球核心的独特存在。然而,奥尔德姆并没有感到地震。两周前,他离开了印度地质调查局(GSI)加尔各答办公室,由他的同事托马斯·亨利·迪格斯·拉·Touche(1856-1938)照料(见图1)。现在,最近发现由加尔各答及其中心地区的La Touche写给他的妻子Nancy的信件,提供了地震后调查的第一手日常资料,其中包括他在野外建造的仪器的地震图,费用为“不到六便士”,从锡片,悬浮的巨石,玻璃珠和划伤玻璃板的竹针中提取(LaTouche纸,1880-1913年)。

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