A long source area of the 1906 Colombia–Ecuador earthquake estimated from observed tsunami waveforms

Earth, Planets and Space

Yusuke Yamanaka¹  Yuichiro Tanioka²  Takahiro Shiina² 

[1]Department of Civil Engineering, The University of Tokyo

[2]Institute of Seismology and Volcanology, Hokkaido University

关键词: 1906 Colombia–Ecuador earthquake;    Slip distribution;    Inverse analysis;    Tsunami waveforms;   

DOI  :  10.1186/s40623-017-0750-z

来源: DOAJ

【 摘 要 】

Abstract The 1906 Colombia–Ecuador earthquake induced both strong seismic motions and a tsunami, the most destructive earthquake in the history of the Colombia–Ecuador subduction zone. The tsunami propagated across the Pacific Ocean, and its waveforms were observed at tide gauge stations in countries including Panama, Japan, and the USA. This study conducted slip inverse analysis for the 1906 earthquake using these waveforms. A digital dataset of observed tsunami waveforms at the Naos Island (Panama) and Honolulu (USA) tide gauge stations, where the tsunami was clearly observed, was first produced by consulting documents. Next, the two waveforms were applied in an inverse analysis as the target waveform. The results of this analysis indicated that the moment magnitude of the 1906 earthquake ranged from 8.3 to 8.6. Moreover, the dominant slip occurred in the northern part of the assumed source region near the coast of Colombia, where little significant seismicity has occurred, rather than in the southern part. The results also indicated that the source area, with significant slip, covered a long distance, including the southern, central, and northern parts of the region.

【 授权许可】

Unknown