Relationship Between Subduction Erosion and the Up?Dip Limit of the 2014 Mw 8.1 Iquique Earthquake

The aftershock distribution of the 2014 Mw 8.1 Iquique earthquake offshore northern Chile, identified from a long-term deployment ocean bottom seismometers installed eight months after mainshock, in conjunction with seismic reflection imaging, provides insights into processes regulating updip limit coseismic rupture propagation. Aftershocks mainshock hypocenter frequently occur upper plate and are associated normal faults data. We propose that seismicity near boundary documents subduction erosion removes mass base wedge results faulting plate. combination very little or no sediment accretion over millions years has resulted weak aseismic frontal wedge. Our observations thus link shallow zone to control evolution overriding