Seismic Gap di Sesar Geser Sumatera

Abstract

Sumatra   has  a  tectonic  system   be interesting, because there are subduction system which  resulted  in below  the  Sumatran  mainland there  are  19  fault  segment  that  extends  from Banda Aceh to the Sunda Strait. The purpose of this  study  is  to  determine  the  value  of  seismic activity (a) and the value of the fragility of the rock (b)  in  each  segment  along  the  Sumatran  fault, using the Gutenberg-Richter earthquake database BMKG    and   ISC   (International    Seismological Center)  from  start  till  01-01-1964   31-05-2012. Segment Aceh Barumun and has  a  value of a = 4809  and  4770,  the  highest  compared  to  other segments below the Sumatran mainland these, a highest   value   of   this   means   Barumun   and Segment  Aceh  has  the  highest  level  of seismic activity,  while  Segment  Sumpur  and  Sianok  in West  Sumatra  have  b  values  were  low at 0237 and 0382. The low value of b clearly illustrated by the seismic zone gap in this region. The lowest b value means the value of the smallest vulnerability so as to have a fairly high elasticity and capable of storing  large stress, before being released as an earthquake. So Sumpur and Sianok segment is a segment that needs to be  watched, because the rocks on this segment could at any time have the potential    earthquake   with    enormous    power. Making  research  sites in each segment Sumatra fault  because  this  region  is megathrust  and  the surface has a lot of settlements, which is expected to  know  the  location  that  has  a  high  seismic activity  and  a  low  value  fragility  rocks,  can  be used as a reference for the purposes of mitigation in the region