VELOCITY VARIATION ANALYSIS BY USING AMBIENT NOISE CROSS CORRELATION ASSOCIATED WITH AMBON EARTHQUAKE 2019
Ambient noise interferometry has become one effective method to monitor relative velocity changes ini pre seismic, coseismic and post seismic phase. This research use ambient noise cross-correlation technique to compute empirical Green’s Function between station pairs from January to Desember 201...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/70845 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Ambient noise interferometry has become one effective method to monitor relative
velocity changes ini pre seismic, coseismic and post seismic phase. This research
use ambient noise cross-correlation technique to compute empirical Green’s
Function between station pairs from January to Desember 2019. Velocity variation
focused on Ambon 6.6 Mw earthquake on September 26, 2019. ????????/???? computed by
using Moving Wondow Cross Spectrum in microseism frequency range between
0.1 – 1.0 Hz. Velocity significantly dercreased following the mainshock event and
reached -0.35% gradually in 5-10 days. After reached its minimum value, velocity
bounced back to and increased gradually 0.4% and fluctuated between its original
base values. Aftershock event around the hypocenter and fault plane caused
fluctuation following the mainshock until end of December. Rapid and significant
decreased ????????/???? value may caused by deformation and cracking mechanism around
the hypocenter. Meanwhile, the bounced back ????????/???? value after reach its minimum
value took longer duration (7-14 days) indicated as post seismic relaxation and
closing crack mechanism involved in post-seismic event in the medium. |
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