مجله ژئوفیزیک ایران

مجله ژئوفیزیک ایران

Seismic vulnerability estimation based on shear strain analysis at Mount Gamalama, Indonesia

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نوع مقاله : مقاله پژوهشی‌

نویسندگان
Andri Wijaya Bidang 1
Agustya Adi Martha 2
Safri Burhanuddin 3
1 Ph.D. Student, Agency for Meteorology Climatology and Geophysics, Jakarta, Indonesia
2 Ph.D., The National Research and Innovation Agency, Jakarta, Indonesia
3 Associate Professor, Department of Geology, Faculty of Engineering, Hasanuddin University, South Sulawesi, Indonesia
10.30499/ijg.2025.548140.1725
چکیده
A seismic vulnerability assessment was performed at Mount Gamalama using Horizontal to Vertical Spectral Ratio (HVSR)-derived microtremor data and shear strain estimation methods. The measurement instrument utilized was a three-component portable seismometer (Lunitek). Microtremor data acquisition was performed at 123 locations with a duration of 30-45 minutes and a spacing of 250-500 meter. The primary data consisted of recorded microtremor signals from the seismometer. within the research coordinate range of 0.7526°N – 0.868°N and 127.292°E – 127.3926489°E. Data were processed to quantify dominant frequency and amplification, which were used to model seismic responses under Peak Ground Acceleration (PGA) scenarios from 6.2%gal to 75%gal. Data processing was conducted using two platforms: Geopsy for microtremor analysis and Surfer for interpolation. Structural damage ranging from surface vibration to major cracking and collapse was identified. Zones A, B, and C were shown to exhibit increasing levels of vulnerability, with Zone A being most susceptible at high acceleration levels. Amplification effects caused by surface geological conditions were observed, particularly in zones characterized by alluvial and pyroclastic materials. Elevated shear strain values were associated with soil types D through K, reinforcing their contribution to local seismic hazard. The spatial progression of seismic risk areas was confirmed to correlate with Peak Ground Acceleration (PGA) escalation, supporting the application of this methodology for future regional disaster preparedness.
کلیدواژه‌ها
Seismic, Gamalama, HVSR, vulnerability, microtremor

موضوعات

عنوان مقاله English

Seismic vulnerability estimation based on shear strain analysis at Mount Gamalama, Indonesia

نویسندگان English

Andri Wijaya Bidang 1
Agustya Adi Martha 2
Safri Burhanuddin 3
1 Ph.D. Student, Agency for Meteorology Climatology and Geophysics, Jakarta, Indonesia
2 Ph.D., The National Research and Innovation Agency, Jakarta, Indonesia
3 Associate Professor, Department of Geology, Faculty of Engineering, Hasanuddin University, South Sulawesi, Indonesia
چکیده English

A seismic vulnerability assessment was performed at Mount Gamalama using Horizontal to Vertical Spectral Ratio (HVSR)-derived microtremor data and shear strain estimation methods. The measurement instrument utilized was a three-component portable seismometer (Lunitek). Microtremor data acquisition was performed at 123 locations with a duration of 30-45 minutes and a spacing of 250-500 meter. The primary data consisted of recorded microtremor signals from the seismometer. within the research coordinate range of 0.7526°N – 0.868°N and 127.292°E – 127.3926489°E. Data were processed to quantify dominant frequency and amplification, which were used to model seismic responses under Peak Ground Acceleration (PGA) scenarios from 6.2%gal to 75%gal. Data processing was conducted using two platforms: Geopsy for microtremor analysis and Surfer for interpolation. Structural damage ranging from surface vibration to major cracking and collapse was identified. Zones A, B, and C were shown to exhibit increasing levels of vulnerability, with Zone A being most susceptible at high acceleration levels. Amplification effects caused by surface geological conditions were observed, particularly in zones characterized by alluvial and pyroclastic materials. Elevated shear strain values were associated with soil types D through K, reinforcing their contribution to local seismic hazard. The spatial progression of seismic risk areas was confirmed to correlate with Peak Ground Acceleration (PGA) escalation, supporting the application of this methodology for future regional disaster preparedness.

کلیدواژه‌ها English

Seismic, Gamalama, HVSR, vulnerability, microtremor
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