STUDI MIKROSEISMIK UNTUK MENDETEKSI PERUBAHAN GARIS PANTAI DENGAN INDIKATOR INDEKS KERENTANAN SEISMIK, PEAK GROUND ACCELERATION DAN GROUND SHEAR STRAIN DI PROVINSI BENGKULU
Shores of Bengkulu Province are geographically located in the subduction zone between the Indian-Australian plate and the Eurasian plate, so it is often hit by earthquakes. Many researchs have been done to correlate the power of the earthquake with the impact of...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2014
|
| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/131566/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=72061 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Universitas Gadjah Mada |
| Summary: | Shores of Bengkulu Province are geographically located in the subduction zone
between the Indian-Australian plate and the Eurasian plate, so it is often hit by
earthquakes. Many researchs have been done to correlate the power of the
earthquake with the impact of damages. This research aims to: (1) determine the
characteristics of the seismic vulnerability index based on microseismic data, peak
ground acceleration and ground shear strain on any types of beach in Bengkulu
province and correction with the rate of change shorelines.
For the purposes of this research, it has been carried out taking 127 points of
microseismic data along the shore of Bengkulu by using short-period
seismometers with 3 components. The measurements for each point was 30
minutes. Data collection was not done by gridding, but by specifying the type of
beach. Data collection points aretaken for each type of shore. The amount of data
taken at each type of beach based onthe areaof type shore. For the type of flat fine
sandy beach, it was taken 21 points, a flat rocky beach was taken 12 points, 12
points of beach muddy flat, flat sandy beaches rugged was taken 20 points, steep
rocky lava beach was taken 15 points, steep rocky coast clay was taken 20 points,
steep rocky coast tuffaceous clay was 16 points, and tufa steep sandy beach stone
was taken 15 points. Historical data of earthquakes in 1900 to 2009 are other
supporting data.
The data were processed using Geopsy to obtain the spectrum. The validation of
microseismic spectrum to obtain a reliable spectrum refers to the rules of
SESAME 2004, obtained 122 reliable spectrums and unreliable spectrums. The
validation is done for obtaining clear peak, obtained 97 spectra that show clear
peaks and 30 did not show the clear spectral peaks.
The microseismic data were analyzed quantitatively through Horizontal to
Vertical Spectral Ratio (HVSR), while the earthquake history of the data were
processed by using the attenuation equation. There are two attenuation equations,
(1) Kanai and (2) Fukushima-Tanaka equation.
The results showed that the average value of the seismic vulnerability index based
on microseismic changed with the type of shore . The average value for the
seismic vulnerability index (1) the type of flat fine sandy beach is 2.1 , (2) a
muddy flat beach is 7.6 , (3) a flat rocky beach is 0.5 , (4 ) coarse sandy flat beach
is 2.9 , (5) a steep rocky lava beach is 1.3 , (6) the steep rocky shore clays is 16.1 |
|---|