MONITORING CRUSTAL ACTIVITY USING B – VALUE APPROACH ALONG THE SUMATRA-ANDAMAN REGION DURING 1977 – 2019

Calculation of the b-value for the Sumatra-Andaman region have been
carried out and analyzed. The study area is broken down into 64 regions in more
detail, analyzed to monitor the crust activity. This study aims to investigate the b�value distribution of the Sumatra earthquake catalog 1977 to 2019 and also helps
to understand the statistical seimology for monitor the crustal activity in Sumatra�Andaman region. This research Temporal variation of the b-value was observed
through 9,034 earthquakes in the Sumatra-Andaman region during the period
1977 to 2019. The earthquake distribution was analyzed using the Gutenberg�Richter equation (1954) which was adjusted for the seismic level with a
magnitude ≥ 4.5 Mw and deep of 300km. Determination of seismotemic
parameters (b-value) was calculated and analyzed temporal distribution and
spatial distribution. The temporal distribution the b-value for earthquakes from 64
study data locations ranges from 0.482 to 2.725. The spatial distribution
examining how the condition of the crustal in the research area has affected the
observed change in b-value, this geographical distribution serves as the baseline
for crustal monitoring. A low b-value score will be displayed in areas where stress
levels have significantly increased.
Keyword: b-value, crustal activity, Sumatra-Andaman Earthquakes.