scholarly journals Analisis Percepatan Getaran Tanah Maksimum Akibat Gempabumi Di Wilayah Nusa Tenggara Dengan Metode Probablistic Seismic Hazard Analysis (PSHA)

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Uzlifatul Azmiyati
Keyword(s):  
Seismic Hazard ◽  
Peak Ground Acceleration ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Ground Acceleration

Wilayah kepulauan Nusa Tenggara berada pada zona pertemuan lempeng tektonik dan memiliki sesar-sesar aktif. Kondisi ini menyebabkan wilayah ini sering dilanda bencana gempabumi. Oleh karena itu penelitian mengenai percepatan maksimum tanah  (peak  ground  acceleration  (PGA))  yang  menggambarkan tingkat bahaya akibat gempa menjadi penting sebagai langkah mitigasi awal. Metode yang digunakan dalam penelitian ini adalah metode probabilistic seismic hazard analysis (PSHA) dengan bantuan perangkat lunak USGS PSHA 2007. Metode  PSHA  memperhitungkan  dan  menggabungkan  ketidakpastian  dari mekanisme   kejadian  gempa,  lokasi,  dan  kejadian   frekuensi   gempa  untuk mendapatkan gambaran tingkat bahaya suatu lokasi. Tingkat bahaya tersebut ditunjukkan dalam bentuk  nilai PGA. Penelitian ini menggunakan data dari katalog gempa NEIC-USGS dan BMKG untuk daerah wilayah  Kepulauan Nusa Tenggara antara 40-120LS dan 1100-1250BT dari tahun 1973 sampai tahun 2011. Analisis yang telah dilakukan menghasilkan variasi nilai PGA antara 0g-0,50g. Dari peta PGA diketahui bahwa daerah Pulau Sumbawa, Sumba, Timor, Flores dan Kupang memiliki tingkat bahaya gempabumi tinggi dengan nilai PGA antara 0,25g - 0,50g. Daerah Pulau Bali dan Lombok bagian Selatan memiliki tingkat bahaya gempa rendah dengan nilai PGA antara 0,1g - 0,25g.

Probabilistic seismic hazard analysis model for the Philippines

2020 ◽  
Vol 36 (1_suppl) ◽  
pp. 44-68 ◽  
Author(s):  
Henremagne C Peñarubia ◽  
Kendra L Johnson ◽  
Richard H Styron ◽  
Teresito C Bacolcol ◽  
Winchelle Ian G Sevilla ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Complex Geometry ◽  
Hazard Analysis ◽  
The Philippines ◽  
Probabilistic Seismic Hazard Analysis ◽  
Point Sources ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Analysis Model ◽  
Ground Acceleration

The Philippine archipelago is tectonically complex and seismically hazardous, yet few seismic hazard assessments have provided national coverage. This article presents an updated probabilistic seismic hazard analysis for the nation. Active shallow crustal seismicity is modeled by faults and gridded point sources accounting for spatially variable occurrence rates. Subduction interfaces are modeled with faults of complex geometry. Intraslab seismicity is modeled by ruptures confined to the slab volume. Source geometries and earthquake rates are derived from seismicity catalogs, geophysical data sets, and historic-to-paleoseismic constraints on fault slip rates. The ground motion characterization includes models designed for global use, with partial constraint by residual analysis. Shallow crustal faulting near metropolitan Manila, Davao, and Cebu dominates shaking hazard. In a few places, peak ground acceleration with 10% probability of exceedance in 50 years on rock reaches 1.0 g. The results of this study may have utility for defining the design base shear in the National Structural Code of the Philippines.

scholarly journals Analysis of Changes in Seismicity Pattern for Probabilistic Seismic Hazard Analysis (PSHA) and Mitigation: Mapping Probability Difference before the Large Earthquake and Its Implementation in PSHA & Mitigation around Northern Sumatra

2020 ◽  
Author(s):  
Wahyu Triyoso ◽  
Tedi Yudistira ◽  
David P. Sahara
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Large Earthquake ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Ground Acceleration ◽  
Seismicity Rate ◽  
Seismicity Pattern ◽  
Major Earthquake

Abstract The probability difference before the occurrence of a large earthquake is mapped in the northern part of Sumatra, taking the range of Region Time Length (RTL) before a major earthquake (December 26, 2004) around 15 years. By normalizing the absolute value of probability difference between two periods of RTL and before RTL, the Seismic Quiescence Index (SQI) is then defined. Probability difference analysis is done by dividing observations of shallow earthquake periods into two periods based on the similarity gradient of the annual earthquake production, namely 1963-1990 and 1991-November 2004. The results showed that areas with relatively high SQI were consistent with the presence of major earthquake events after November 2004 to 2016 that are sorted by a radius of 300 km with the center point being the epicenter position of the December 2004 earthquake. The implementation of the SQI was then used for probabilistic seismic hazards study and analysis based on an integratedmodel that is derived based on the estimated of seismicity rate of around the subduction zone and active fault of Sumatra Fault Zone (SFZ) sources. The map of Probabilistic Seismic Hazard Analysis (PSHA) is then constructed based onPeak Ground Acceleration (PGA) estimated for a 10% Probability Exceedance (PE) level in 50 years. The results of this study may be very useful for earthquake mitigation and modeling efforts for PSHA going forward.

scholarly journals Selection of the appropriate methodology for the probabilistic seismic hazard analysis on the territory of the Republic of Serbia

2006 ◽  
Vol 4 (2) ◽  
pp. 101-113
Author(s):  
Borko Bulajic ◽  
Miodrag Manic
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Eurocode 8 ◽  
Probabilistic Seismic Hazard ◽  
Hazard Maps ◽  
Ground Acceleration ◽  
The Republic ◽  
Selection Of

This paper presents a review of the approaches to the probabilistic seismic hazard analysis as well as discussion regarding the selection of the appropriate methodology of probabilistic seismic hazard analysis for the territory of the Republic of Serbia. Use of the deductive approach has been suggested, as well as that the new Serbian seismic hazard maps should be expressed through the values of the peak ground acceleration, having in mind that the new hazard maps for the Republic of Serbia should be compiled in compliance with the recommendations of the Eurocode 8.

scholarly journals Probabilistic Seismic Hazard Analysis Using the New Correlation Relationships for Magnitude Scales

2018 ◽  
Vol 4 (4) ◽  
pp. 872 ◽  
Author(s):  
Behrooz Alizadeh ◽  
Saeid Pourzeynali
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Mazandaran Province ◽  
Ground Acceleration ◽  
Seismicity Parameters ◽  
North Of Iran ◽  
Recent Earthquakes

Amol is one of the oldest cities located in north of Iran, Mazandaran province, and its history dates back to the pre-Islamic period. Amol is a city with an area about 3000 square kilometers, a population exceeding 370,000, and includes the old and famous neighborhoods that have a religious, commercial, and service with a long history background. Considering the importance of buildings constructed in this city and the need for their preservation and restoration on one hand, and the occurrence of many severe earthquakes in the past centuries, as well as the recent earthquakes of the last century, on the other hand, encourage us to study the seismicity of this city. Therefore, in this paper, by considering the historical and instrumental earthquakes recorded within a radius of 150 km around this city and the seismic mechanism of the faults located in this region, probabilistic seismic hazard analysis of the area is studied. Then, using the probabilistic relations of the seismic hazard analysis of the Kijko 2000 computer program, the seismicity parameters and the return periods of the earthquake magnitudes are obtained for the area, and at the end, the horizontal peak ground acceleration is zoned for this city.

scholarly journals Probabilistic Seismic Hazards Analysis of Ambikapur-Chhattisgarh (India)

2021 ◽  
Vol 9 (2) ◽  
pp. 83-91
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Peak Ground Acceleration ◽  
Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard ◽  
Attenuation Relationship ◽  
Ground Acceleration ◽  
Probability Of Exceedance ◽  
Maximum Peak

The present study reveals the seismic hazard analysis of district headquarter Ambikapur, in the state of Chhattisgarh. Usually, seismic hazard study attempts to analyze two different kinds of anticipated ground motions, “the Deterministic Seismic Hazard Analysis (DSHA)” and “the Probabilistic Seismic Hazard Analysis (PSHA)”. The maximum Peak Ground Acceleration (PGA) has been estimated by using Iyengar and Raghu Kanth (2004) attenuation relationship. The regional recurrences relation is obtained by using available historical data and 33 numbers of seismic sources (liner faults) that are likely to cause ground motion, around the study area. The probabilistic seismic hazard analysis has been applied over Ambikapur, to assess the probability of exceedance for various PGA(g)values the seismic hazard curve has been developed by using Raghu Kanth and Iyengar (2007) attenuation relationship. Theprobability of exceedance for PGA(g) values as 0.01g,0.05g,0.10g,0.15g for their corresponding return periods have also been assessed. The liner seismic source having length 46kM, produced maximum peak ground motion as 0.15259g for recurrence period of 100 years. For Ambikapur district headquarter the probability of exceedance for 0.1g with a return period of 8788 years is estimated as 63.22%. Maximum Peak Ground Acceleration value and % probability of exceedance reflects that the seismicity of Ambikapur district headquarter is found to have exceeded from 0.1g as recommended by IS:1893 (Part 1): 2016 (Sixth Revision) for Chhattisgarh. Hence, it is recommended from present study that, Ambikapur should be included in zone III instead of zone II.

PEMETAAN DAERAH RENTAN GEMPA BUMI SEBAGAI DASAR PERENCANAAN TATA RUANG DAN WILAYAH DI PROVINSI SULAWESI BARAT

KURVATEK ◽  
2017 ◽  
Vol 1 (2) ◽  
pp. 41-47
Author(s):  
Marinda noor Eva
Keyword(s):  
Seismic Hazard ◽  
Hazard Analysis ◽  
Probabilistic Seismic Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Probabilistic Seismic Hazard

Penelitian mengenai daerah rawan gempa bumi ini menggunakan Metode Probabilistic Seismic Hazard Analysis (PSHA) di Provinsi Sulawesi Barat, dengan tujuan untuk memetakan tingkat kerawanan bahaya gempa bumi di Kabupaten Mamasa. Penelitian ini menggunakan data kejadian gempa bumi di Pulau Sulawesi dan sekitarnya dari tahun 1900 – 2015. Hasil pengolahan PSHA menggunakan Software Ez-Frisk 7.52 yang menghasilkan nilai hazard di batuan dasar pada kondisi PGA (T = 0,0 sekon), dengan periode ulang 500 tahun dan 2500 tahun berkisar antara (149,54 – 439,45) gal dan (287,18 – 762,81) gal. Nilai hazard di batuan dasar dengan kondisi spektra T = 0,2 sekon untuk periode ulang 500 tahun dan 2500 tahun adalah (307,04 – 1010,90) gal dan (569,48 – 1849,78) gal. Nilai hazard di batuan dasar dengan kondisi spektra T = 1,0 sekon untuk periode ulang 500 tahun dan 2500 tahun diperoleh nilai (118,01 – 265,75) gal dan (223,74 – 510,92) gal. Berdasarkan analisis PSHA, nilai PGA di Provinsi Sulawesi Barat dominan dipengaruhi oleh sumber gempa sesar.

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