P wave tomographic imaging of the crust down to a depth of 90 km is performed beneath the region encompassing Sumatra, Java, Malacca Strait, peninsular Malaysia and Singapore. Inversion is performed with 99,741 first-arrival p waves from 16,196 local and regional earthquakes occurred around the Sumatra Subduction Zone (SSZ) between 1964 and 2018. Tomographic results show low-velocity (low-V) anomalies that reflect both accretion and possibly, asthenospheric upwelling associated with subduction of the Australian Plate beneath Eurasia around the SSZ. The prominent low-V anomaly is thickest around the Conrad, extending beneath Straits of Malacca and parts of peninsular Malaysia, but disappears around the Moho in the region. Below the Moho, the subducting slab, represented by a high-velocity (high-V) anomaly, trends in the orientation of Sumatra. At these depths, the eastern shorelines of Sumatra, most parts of Malacca Strait and the west coast of peninsular Malaysia show varying degrees of positive velocity anomalies. We consider that asthenospheric upwelling around the SSZ may provide heat source for the 40 or more hot springs distributed north–south in peninsular Malaysia. Different east–west and north–south cross-sections reveal the subsurface anomalies at various parts of the region. The predominant low-V anomaly is less than 35 km in depth, but other low-V anomalies are deeper.

在包括苏门答腊，爪哇，马六甲海峡，马来西亚半岛和新加坡在内的区域下方，对地壳进行了长达90 km的P波断层成像。反转以99,741初到p在1964年至2018年之间，苏门答腊俯冲带（SSZ）周围发生了16,196次地方和区域地震的地震波。层析成像结果表明，低速（low-V）异常既反映了吸积又可能反映了软流圈上升与下方澳大利亚板块的俯冲有关。 SSZ附近的欧亚大陆。突出的低伏距异常在康拉德附近最厚，在马六甲海峡和马来西亚半岛的部分地区下方延伸，但在该地区的莫霍面附近消失。在莫霍面以下，以高速（高V）异常为代表的俯冲板块向苏门答腊定向。在这些深度处，苏门答腊岛东部海岸线，马六甲海峡大部分地区和马来西亚半岛西海岸均表现出不同程度的正速度异常。我们认为，SSZ周围的软流圈上升可能为马来西亚半岛南北分布的40个或更多温泉提供热源。不同的东西向和南北向横截面揭示了该地区不同区域的地下异常。主要的低V异常深度小于35 km，但其他低V异常更深。