Study on the 1906 Colombia‐Ecuador Megathrust Earthquake Based on Tsunami Waveforms Observed at Tide Gauges: Release Variation of Accumulated Slip Deficits in the Source Area

Study on the 1906 Colombia‐Ecuador Megathrust Earthquake Based on Tsunami Waveforms Observed at Tide Gauges: Release Variation of Accumulated Slip Deficits in the Source Area
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基于验潮仪观测海啸波形的1906年哥伦比亚-厄瓜多尔特大地震研究:震源区累积滑移赤字的释放变化

DOI:
10.1029/2020jb021375
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发表时间:
2021
期刊:
Journal of Geophysical Research: Solid Earth
影响因子:
--
通讯作者:
Yuichiro Tanioka
Yuichiro Tanioka
中科院分区:
--
文献类型:
--
作者:
Yusuke Yamanaka;Yuichiro Tanioka

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1906年哥伦比亚-厄瓜多尔特大逆冲地震后发生的海啸被几个潮汐计观测并记录下来。在这项研究中,首先将潮汐计记录数字化,比较估计的天文潮位变化,并提取观测到的海啸波形。利用观测到的海啸波形进行逆分析,我们成功地建立了一个滑动分布模型,与以往的研究相比,该模型为潮汐站提供了改进的海啸波形。根据已开发的震源模型与哥伦比亚和厄瓜多尔周围其他重大地震的破裂区域的比较,1906年的地震已经使受1979年地震影响的地区破裂,导致累积滑差的大量释放。相反,虽然1906年地震的破裂区可能覆盖了1958年和1942年地震的震源区,但这些地区在地震期间的释放是中等和不显著的,1906年地震后仍然存在较大的滑动亏缺。这些结果表明,1906年地震震源区累积滑差的释放程度变化很大。
A tsunami that followed the 1906 Colombia‐Ecuador megathrust earthquake was observed and recorded by several tide gauges. In this study, tide gauge records were first digitized from documents comparing the estimated astronomical tide level changes, and the observed tsunami waveforms were extracted. An inverse analysis was conducted using the observed tsunami waveforms, and we successfully developed a slip distribution model that produced improved tsunami waveforms for tide gauge stations compared with previous studies. Based on a comparison of the developed source model and ruptured areas of other significant earthquakes around Colombia and Ecuador, the 1906 earthquake already ruptured an area affected by the 1979 earthquake, resulting in a substantial release of accumulated slip deficits. In contrast, although the ruptured area of the 1906 earthquake likely covered the source areas of the 1958 and 1942 earthquakes, the release in these areas during the earthquake was moderate and insignificant, and large slip deficits remained after the 1906 earthquake. These results demonstrate that the extent of the release of accumulated slip deficits varied greatly in the source area of the 1906 earthquake.
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