THE APPLICATION OF HILBERT HUANG TRANSFORM ON HVSR CURVE CALCULATION FOR ANALYSIS OF POTENTIAL EARTHQUAKE HAZARD AT LEMBANG FAULT
The Lembang fault is an active fault of about 12 km from north of Bandung region. The existence of the Lembang fault provide a potential seismic hazard in the Bandung and surrounding area. Based on earthquake katalog, there was an earthquake occurred in 2011 which affected several residential bui...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/69630 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Lembang fault is an active fault of about 12 km from north of Bandung region.
The existence of the Lembang fault provide a potential seismic hazard in the
Bandung and surrounding area. Based on earthquake katalog, there was an
earthquake occurred in 2011 which affected several residential buildings in
Cisarua District, Lembang. The potential seismic hazard is influenced by the
condition of the subsurface layer as a medium for transmitting earthquake waves.
The condition of the subsurface layer can be determined using a geophysical
method approach, such as the Horizontal to Spectral Ratio (HVSR) method.
Commonly, the HVSR curve estimation uses the Fourier Transform principle to
obtain the frequency spectrum for calculating the spectral ratio of the horizontal
and vertical components. A combination of sinusoidal and stationary base signals
can be used, but this transformation still has limitations. And it would be difficult
to remove local noise in microtremor recordings. We propose to apply Hilbert
Huang Transform (HHT) to obtain the HVSR curve. We compare the HVSR curve
of the Fourier Transform and the Hilbert Huang Transform at dominant frequency
in the range 0.1-8Hz and relatively low. We can interpret as the higher potential of
seismic hazard around West Bandung Regency, precisely around the Lembang
fault. On the other hand, the high amplification factor which is area indicates that
there is a significant potential for earthquake hazard can be identified in
Parongpong, Cisarua and Ngamprah. Based on the value of Vs30 obtained between
32.6 m/s – 186.7 m/s, it can be concluded that the subsurface rock layers in the
study area are dominated by soft layers and has high seismic hazard
potential.earthquake hazard potential. |
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