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首页> 外文期刊>Seismological research letters >The 21 May 1960 Mw?8.1 Concepción Earthquake: A Deep Megathrust Foreshock That Started the 1960 Central‐South Chilean Seismic Sequence
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The 21 May 1960 Mw?8.1 Concepción Earthquake: A Deep Megathrust Foreshock That Started the 1960 Central‐South Chilean Seismic Sequence

机译：1960年5月21日MW？8.1概念地震：一个深巨大的前座，开始于1960年中南智利地震序列

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摘要

One of the most notable seismic sequences in modern times was recorded in May 1960 along the southern Chilean subduction zone. The sequence started on 21 May with the Mw?8.1 Concepción earthquake; 33?hr later the Mw?9.5 Valdivia megathrust earthquake occurred, the largest ever recorded in the instrumental period. These events changed the geomorphology of the coast along more than 1000?km, generated extensive structural damage in the main cities of central‐south Chile, and triggered a Trans‐Pacific tsunami. Observed land‐level changes due to both earthquakes were reported in 1970. These observations were ascribed to both events but have been used to study only the general source properties of the 22 May Valdivia mainshock. Here, we separate these data to constrain for the first time the slip distribution of the 21 May Concepción earthquake, applying a Bayesian approach that considers uncertainties in the data. Our results show that the Mw?8.1 Concepción earthquake ruptured a deep segment of the megathrust, concentrated in a compact zone below the Arauco peninsula between depths of 20 and 50?km. Tsunami generation from this deep source agrees well with the tsunami arrival times and small amplitudes recorded by tide gauges along the Chilean coast. Our study highlights the importance of the 21 May 1960 Concepción earthquake in the context of large historical Chilean earthquakes.
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