通常认为逆冲型或正断型的海底地震可以引发海啸。然而，2018年9月28日印尼帕卢发生了一次走滑型Mw 7.5级地震，并罕见地引发了破坏性海啸灾害。研究此次走滑型地震的破裂过程及其引发海啸的成因，对海啸预警和减灾工作有着重要意义。为此，本项目计划利用InSAR观测对断层走向、分布的良好约束，构建多段、不同走向的子断层模型，联合远场体波和面波波形反演此次地震的破裂过程，计算地震引起的地表水平位移和垂向位移。并基于高精度的水深数据计算帕卢湾海底地形梯度，研究地震产生的水平位移因坡度引起的等效水高变化，分析其在此次海啸激发中的作用。通过本项目研究，可以深化对走滑型地震引发海啸的认识，从而为未来可能发生的类似海啸事件提供参考。

Tsunami is usually excited by the vertical motion of seafloor due to thrust or normal-fault earthquakes. However, a shallow Mw 7.5 strike-slip earthquake produced destructive tsunami with waves of up to several meters along the coast of Palu Bay in Sulawesi region, Indonesia. Study of the rupture process and tsunami excitation of this earthquake is of great significance to the tsunami early warning and disaster mitigation in China and even around the world. This project plans to construct a multi-segment and different strike sub-fault model based on InSAR observation, and investigate the rupture process of this earthquake by finite-fault inversion using teleseismic body and surface waves. To explore the causes of the tsunami excitation, we calculate ground deformations and equivalent water height changes due to horizontal motion along the slope near the coastline area. Moreover, we compute the vertical displacement on the seafloor in Palu Bay. This study can improve the understanding of the tsunami excitation of the strike-slip earthquake, which will provide an important reference for such tsunami events that may occur in the future.