Abstract. We resolve a previously unrecognized shallow subducting seamount from a re-processed multichannel seismic depth image crossing the 1994 M7.8 Java tsunami earthquake slip area. Seamount subduction is related to the uplift of the overriding plate by lateral shortening and vertical thickening, causing pronounced back-thrusting at the landward slope of the forearc high and the formation of splay faults branching off the landward flank of the subducting seamount. The location of the seamount in relation to the 1994 earthquake hypocentre and its co-seismic slip model suggests that the seamount acted as a seismic barrier to the up-dip co-seismic rupture propagation of this moderate size earthquake. The wrapping of the co-seismic slip contours around the seamount indicates that it diverted rupture propagation, documenting the control of forearc structures on seismic rupture.

中文翻译：

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东爪哇省的海洋前臂结构及其在1994年爪哇海啸中的作用

摘要。我们从经过1994年M7.8爪哇海啸地震滑移区的多通道地震深度图像重新处理后，解析了先前无法识别的浅层俯冲海山。海山俯冲与侧向缩短和垂直增厚使上覆板抬升有关，在前臂高处的陆坡处引起明显的反冲，并形成从俯冲海山的陆面分支出的张开断层。海山相对于1994年地震震中的位置及其同震滑移模型表明，海山对这一中等规模地震的上倾同震破裂传播起到了地震屏障的作用。围绕海山的同震滑动轮廓的包裹表明它转移了破裂的传播，