A better comprehension of the shallow strike-slip seismicity along the Sunda Trench is achieved by superimposing the Wharton basin fracture zones, magnetic isochrones, and focal mechanisms to the geometry of the subducting plate. The shallow strike-slip seismicity is generally associated with the north-south trending fracture zones of the basins, which segment the subducting lithosphere into eight main compartments named A-H. Strike-slip earthquakes with magnitudes higher than 4.5 Mw in the time period of 2004–2019 are examined with respect to the thickness and density of the subducting lithosphere, estimated from the lithospheric age. Bulk density ranges from ~3258 to ~3272 and lithospheric thickness from ~74 to ~112 km between the younger fossil spreading axis and the older Compartment H, respectively. ‘Subductability’, a parameter calculated from lithospheric thickness and bulk density, is coined to represent the easiness of subduction and varies for each spreading compartment depending on the lithospheric age. We propose the correlation between the shallow strike-slip seismicity and the contrasts of lithospheric thickness, density and subductability. Considering the available seismic records from the past four decades, a prominent cluster of strike-slip earthquakes is observed along Fracture Zone B-C, which displays a strong subductability contrast, whereas other fracture zones displaying only minor seismicity correspond to low subductability contrasts. Despite a high subductability contrast, slab tearing on the subducting Investigator Fracture Zone between Compartments G and H prevents the generation of strike-slip earthquakes. This result emphasizes the importance of physical and mechanical properties of the subducting lithosphere in localizing the seismicity at subduction zones.

通过将沃顿盆地的断裂带，磁等时线和震源机制叠加到俯冲板的几何形状上，可以更好地理解沿着Sun他海沟的浅层走滑地震活动。浅层走滑地震活动性通常与盆地的南北向断裂带有关，这些断裂带将俯冲岩石圈划分为八个名为AH的主层。根据从岩石圈年龄估算的俯冲岩石圈的厚度和密度，研究了2004-2019年期间强度大于4.5 Mw的走滑地震。在较年轻的化石扩散轴和较旧的隔层H之间，堆密度分别为〜3258至〜3272和岩石圈厚度为〜74至〜112 km。“俯冲性”，根据岩石圈厚度和堆积密度计算得出的参数代表俯冲的难易程度，并且每个扩散舱室的变化取决于岩石圈年龄。我们提出浅层走滑地震活动性与岩石圈厚度，密度和俯冲能力对比之间的相关性。考虑到过去40年的可用地震记录，沿BC断裂带观察到了一个突出的走滑地震群，它显示出很强的俯冲性对比，而其他仅显示出较小地震活动性的断裂带则对应了低俯冲性对比。尽管俯冲力对比很高，但在隔层G和H之间俯冲的研究人员断裂带上的平板撕裂可以防止走滑地震的产生。