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VOL. 8, ISSUE 2 (2023)
Analysis of gravity changes in 2016 Pidie Jaya Earthquake
Authors
Zahra Ayisha, Agus Setyawan, Udi Harmoko, Jatmiko Endro Suseno
Abstract
An earthquake occurred in Pidie Jaya on December 7 2016 with a
magnitude of 6.5 and a depth of 15 km at 05:33 WIB. Based on data from BMKG,
the position of the epicenter is at coordinates 5,250 N – 96,240 E. The
research was carried out using gravity anomaly data from the GRACE Satellite
with a period from 7 November 2016 to 7 January 2017. The 2016 Pidie Jaya
earthquake resulted in changes in gravity anomaly values around the epicenter
of the earthquake because it was a shallow and large-magnitude earthquake. This
research aims to determine the pattern and magnitude of the change in the value
of the temporal variation gravity anomaly around the epicenter due to an
earthquake using the GRACE satellite and to determine the pattern of change in
the temporal variation gravity anomaly associated with the earthquake mechanism
and conditions below the earth's surface around the earthquake epicenter. The
contouring results show that there was polarization on December 11, 2016. Then
the value of the difference in the gravity anomaly also shows a change, the
biggest change being the difference on day 4: December 3, 2016, and December
11, 2016, at the 7th point with a value of 1.582845 mGal. The
smallest anomalous change is found on the difference between day 24, namely
November 13, 2016, and December 31 2016 at point 7 with a value of -0.000595
mGal. These changes are assumed to be caused by the activity of the
Sipopok/Simalanga fault which is influenced by the activity of the Eurasian and
Indo-Australian plates as well as changes in land surface height. Around the
epicenter of the earthquake, there is a low gravity anomaly pattern with the
rocks forming surface deposits composed of fluvial and sand deposits.
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Pages:40-44
How to cite this article:
Zahra Ayisha, Agus Setyawan, Udi Harmoko, Jatmiko Endro Suseno "Analysis of gravity changes in 2016 Pidie Jaya Earthquake". International Journal of Advanced Scientific Research, Vol 8, Issue 2, 2023, Pages 40-44
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