Source Reconstruction of the 1969 Western Sulawesi, Indonesia, Earthquake and Tsunami
Source Reconstruction of the 1969 Western Sulawesi, Indonesia, Earthquake and Tsunami
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DOI：
10.1007/s00024-022-03064-2
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发表时间：
2022-06-11
影响因子：
2
通讯作者：
Imai, Kentaro
中科院分区：
文献类型：
--
作者：
Pranantyo, Ignatius R.;Cipta, Athanasius;Imai, Kentaro
印度尼西亚的苏拉威西岛位于一个复杂和构造活跃的地区，过去曾经历过海啸。1969年2月23日发生在苏拉威西岛西部马杰内地区的地震和海啸是一次重大地震和海啸。对历史记录的解释表明，Mw 7.0地震产生的强烈强度高达修改后的麦加利强度等级VIII。地震之后，发生了异常高的海啸，高达4米，在距离最高观测点25公里的范围内迅速衰减。震源和地震机制分析证实，这是一次具有逆冲机制的内陆地震。地面运动模型能够再现地震强度，但地震情景无法重建海啸观测。解释海啸报告的一个合理的解决方案是地震和0.5 km（3）的潜艇质量故障的组合方案。
The island of Sulawesi, Indonesia, is located in a complex and tectonically active region, and has experienced tsunamis in the past. One of the major earthquake and tsunami events was the 23 February 1969 event that struck the Majene region in western Sulawesi Island. Interpretation of the historical accounts revealed that the Mw 7.0 earthquake generated strong intensity up to VIII on the Modified Mercalli Intensity scale. The earthquake was followed by an unusually high tsunami of 4 m that rapidly decayed within 25 km from the highest observation site. Hypocentre and earthquake mechanism analyses confirmed that it was an inland earthquake with a thrust mechanism. Ground motion modelling is able to reproduce the earthquake intensity but earthquake scenarios are unable to reconstruct the tsunami observations. A plausible solution to explain the tsunami report is from a combined scenario of an earthquake and a submarine mass failure of 0.5 km(3).