Indications of transtensional strike slip fault in the Mount Anak Krakatau based on earthquake focal mechanism data

Abstract

Abstract Anak Krakatau volcano in the Sunda Strait was through pyroclastic materials landslide phenomenon that caused by a tsunami wave at the end of December 2018. Tsunami wave hit the west coast of Pandeglang and part of the coast of Lampung. Recent tectonic activity produces an epicenter around Anak Krakatau volcano, a shallow earthquake depth of 10 - 15 km below the surface. These data were collected by the interpretation of remote sensing DEM SRTM images, focal mechanism, bathymetry, and hillslope analysis. Quantitative analysis in determining the movement mechanism of strike slip faults and the damage zone as the trigger for landslides on the southwestern volcano sidewall. The main fault has N153°E / 74°E rake 9° is related to the surface of stress and strain results of synthetic and antithetic faults. It is suspected that the post-eruption caldera of Krakatau Volcano is the remaining surface openings in the 1883 while erupted. Knowledge of the causes of landslides to be prepared to anticipate broken infrastructure, victims, and tourism along the coast of Banten and Lampung.