Abstract
The tsunami of Sunda Strait occurred on December 22, 2018, at 21:03 West Indonesia Time (zone). An eruption of Mount Anak Krakatau caused an eruption that triggered a landslide on the slopes of Mount Anak Krakatau covering an area of 64 hectares that hit the coastal area of western Banten and southern Lampung and resulted in 437 deaths, 14.059 people were injured, and 33.721 people were displaced. Before the tsunami, signal transmissions (gaps) at the Lava seismograph station installed on the body of Mount Anak Krakatau experienced broken so that Mount Anak Krakatau Observation Post could not record volcanic earthquake signals since December 22, 2018, at 21.03 West Indonesia Time (zone). Given these facts, proper monitoring and analysis were required to monitor and analyze the source of ground vibrations originating from the eruption of Mount Anak Krakatau. Therefore, this study aims to confirm the eruptive activity of Mount Anak Krakatau based on seismic monitoring and analysis sourced from the BMKG's seismic sensor network. The method the author uses is by monitoring the seismic signal recorded by the seismometer and analyzing the seismic signal using the Seiscomp3 software. By the results of monitoring and analysis of seismic data, it was found that the location of the center of the ground shaking was on Mount Anak Krakatau with a magnitude of 3.4, and a depth of 1 km. To anticipate similar tsunami events in the future, it is very necessary to have a tsunami early warning system originating from volcanic activity and volcanic body avalanches.
Highlights
Indonesia is located in an area prone to destructive earthquakes, because of the presence of four active world plates in Indonesian territory, namely the Eurasian plate, the Indo-Australian plate, the Pacific plate, and the Philippine sea plate [1]
Seiscomp3 is related to the Indonesian Tsunami Early Warning System (InaTEWS) seismic sensor station network
Seismic activity that occurred on December 22, 2018, at 20:55 WIB can be monitored by the BMKG seismic network originating from 13 seismic stations around the Sunda Strait area
Summary
Indonesia is located in an area prone to destructive earthquakes, because of the presence of four active world plates in Indonesian territory, namely the Eurasian plate, the Indo-Australian plate, the Pacific plate, and the Philippine sea plate [1]. Anak Krakatau Volcano makes this area very prone to tsunamis, both tsunamis caused by earthquakes and caused by the eruption of volcanic. From year 416 to 2018, the large strength of a tectonic earthquake was occurred on August 24, 1757, in the Java Sea (northeast of the Sunda Strait) with a magnitude of 7.5, and December 16, in 1963. It occurred in Banten with a magnitude of 6.5 [4]. After the paroxysmal eruption in 1883 of the Krakatau Volcanic Complex, a young volcano appeared in the caldera, namely the Anak Krakatau Volcano
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