scholarly journals SEISMIC HAZARD MICROZONATION BASED ON PROBABILITY SEISMIC HAZARD ANALYSIS IN BANDUNG BASIN

2020 ◽  
Vol 30 (2) ◽  
pp. 215
Author(s):  
Anggun Mayang Sari ◽  
Afnindar Fakhrurrozi
Keyword(s):  
Seismic Hazard ◽  
Peak Ground Acceleration ◽  
Residential Buildings ◽  
Hazard Analysis ◽  
Tectonic Setting ◽  
Seismic Source ◽  
Structure Design ◽  
Seismic Hazard Analysis ◽  
Ground Acceleration ◽  
Design Calculations

The geological and seismic-tectonic setting in the Bandung Basin area proliferates the seismicity risk. Thus, it is necessary to investigate the seismic hazards caused by the foremost seismic source that affects the ground motions in the bedrock. This research employed Probability Seismic Hazard Analysis (PSHA) method to determine the peak ground acceleration value. It considers the source of the earthquakes in the radius of 500 km with a return period of 2500 years. The analysis results showed that the Peak Ground Acceleration (PGA) in this region varies from 0.46 g to 0.70 g. It correlates with the magnitude and hypocentre of the dominant earthquake source of the study locations. The PGA value on the bedrock was used as an input to develop the seismic hazard microzonation map. It was composed using the Geographic Information System (GIS) to visualise the result. This research provides a scientific foundation for constructing residential buildings and infrastructure, particularly as earthquake loads in the building structure design calculations. ABSTRACT - Mikrozonasi Bahaya Seismik Berdasarkan Probability Seismic Hazard Analysis di Cekungan Bandung. Kondisi geologi dan seismik-tektonik di Cekungan Bandung meningkatkan risiko kegempaan di wilayah tersebut. Oleh karena itu, perlu dilakukan penelitian tentang bahaya seismik yang disebabkan oleh sumber-sumber gempa di sekitarnya yang mempengaruhi gelombang gempa di batuan dasar. Penelitian ini menggunakan metode Probability Seismic Hazard Analysis (PSHA) untuk menentukan nilai percepatan gelombang gempa di batuan dasar. Lebih lanjut penelitian ini menggunakan sumber gempa dalam radius 500 km dengan periode perulangan 2500 tahun. Hasil analisis menunjukkan bahwa Peak Ground Acceleration (PGA) di wilayah ini bervariasi dari 0,46 g hingga 0,70 g. Hal ini berkorelasi dengan magnitudo dan jarak hiposenter sumber gempa dominan terhadap lokasi penelitian. Nilai PGA di batuan dasar digunakan sebagai input data dalam pembuatan peta mikrozonasi bahaya seismik. Peta mikrozonasi bahaya seismik disusun dan divisualisasikan menggunakan Sistem Informasi Geografis (SIG). Luaran penelitian ini menghasilkan landasan ilmiah pada konstruksi bangunan tempat tinggal dan infrastruktur, khususnya sebagai pembebanan gempa dalam perhitungan desain struktur bangunan.

scholarly journals Mapping of PGA Value Using PSA Method in West Halmahera Nort Maluku

2020 ◽  
Vol 9 (2) ◽  
pp. 116
Author(s):  
Rohima Wahyu Ningrum ◽  
Wiwit Suryanto ◽  
Hendra Fauzi ◽  
Estuning Tyas Wulan Mei
Keyword(s):  
Seismic Hazard ◽  
Return Period ◽  
Peak Ground Acceleration ◽  
Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Earthquake Hazards ◽  
The West ◽  
Ground Acceleration ◽  
Soil Movement ◽  
Megathrust Earthquakes

The earthquake that occurred in the West Halmahera region was very detrimental, even though the human casualties were not very significant. But it will affect the stability and capacity of a region in terms of regional development. The mapping of earthquake-prone areas is carried out by a probabilistic seismic hazard analysis (PSHA) method to analyze soil movement parameters, namely Peak Ground Acceleration so that it can determine earthquake-prone areas in West Halmahera. The results of seismic hazard analysis show that the West Halmahera area is an area that is relatively prone to earthquake hazards because it is still strongly influenced by subduction (megathrust) earthquakes from the Philippine plate, Maluku sea and Sangihe. This is indicated by the value of earthquake acceleration on the Peak Ground Acceleration for the 500 year return period of around 0.38 - 3.69 g and 0.30 - 3.69 g for the 2500 year return period.

scholarly journals Penentuan Percepatan Tanah Puncak di Pulau Simeulue dengan Metode Deterministik

2017 ◽  
Vol 8 (3) ◽  
pp. 135
Author(s):  
Lina Handayani ◽  
Nugroho D. Hananto ◽  
Titi Anggono ◽  
Syuhada Syuhada ◽  
Karit L. Gaol ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Future Development ◽  
Peak Ground Acceleration ◽  
Hazard Analysis ◽  
Seismic Hazard Analysis ◽  
Ground Acceleration ◽  
The Past ◽  
Deterministic Seismic Hazard ◽  
Forearc Region ◽  
Deterministic Seismic Hazard Analysis

ABSTRAKPulau Simeulue terletak di busur muka subduksi Sumatra bagian utara yang merupakan pulau dengan tingkat bahayakegempaan sangat tinggi. Catatan sejarah kegempaan menunjukkan bahwa pulau ini merupakan daerah dengan bahayagempa bumi dan tsunami. Bahaya gempa bumi telah disadari oleh penduduk Pulau Simeulue. Walaupun seluruhpenduduk telah mengetahui adanya potensi bahaya gempa bumi, diperlukan peta daerah bahaya gempa bumi yanglebih terperinci. Peta bahaya gempa bumi ini diperlukan sebagai panduan dalam pengembangan infrastruktur di pulauini. Analisis bahaya gempa bumi dengan metode deterministik dilakukan untuk menyusun peta mikrozonasi bahayagempa bumi Simeulue. Metode ini dipilih berdasarkan kajian dan analisis tektonik dan kegempaan di Simeulue sertadata geologi dan geofisika lainnya. Hasil analisis yang berupa nilai percepatan tanah puncak menunjukkan tingkatbahaya kegempaaan secara keseluruhan di Pulau Simeulue yang sangat tinggi, dengan nilai percepatan 0,7 hingga1,3g. Daerah dengan kemungkinan bahaya tertinggi terletak di daerah pesisir barat laut dan terendah terletak di bagiantenggara Pulau Simeulue.Kata kunci: deterministik, gempa bumi, Pulau Simeulue, percepatan tanah puncakABSTRACTSimeulue Island, located at the forearc region of Sumatra subduction zone, is an island with high seismic hazard.History records show the past disasters caused by great earthquakes and tsunamis. People of Simeulue has alreadyknown the threat of the possible earthquakes and tsunamis. However, better knowledge of detailed microzonation isneeded as a guide for future development of the island. Deterministic seismic hazard analysis was selected for hazardmicrozonation of the island. The analysis was based on the geological and geophysical data. The result of the analysisindicated a high value of peak ground acceleration (PGA) for the whole area of the island. The highest accelerationoccurred along the southwest coast and the lowest occurred at the southeast end part of the Simeulue Island.Keywords: deterministic seismic hazard analysis, earthquake, Simeulue Island, peak ground acceleration

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.

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.

scholarly journals Seismic hazard assessment of Iran

1999 ◽  
Vol 42 (6) ◽  
Author(s):  
B. Tavakoli ◽  
M. Ghafory-Ashtiany
Keyword(s):  
Seismic Hazard ◽  
Peak Ground Acceleration ◽  
Grid Point ◽  
Seismic Hazard Assessment ◽  
Earthquake Hazard ◽  
Seismic Source ◽  
Historical Earthquakes ◽  
Earthquake Insurance ◽  
Ground Acceleration ◽  
Seismic Source Models

The development of the new seismic hazard map of Iran is based on probabilistic seismic hazard computation using the historical earthquakes data, geology, tectonics, fault activity and seismic source models in Iran. These maps have been prepared to indicate the earthquake hazard of Iran in the form of iso-acceleration contour lines, and seismic hazard zoning, by using current probabilistic procedures. They display the probabilistic estimates of Peak Ground Acceleration (PGA) for the return periods of 75 and 475 years. The maps have been divided into intervals of 0.25 degrees in both latitudinal and longitudinal directions to calculate the peak ground acceleration values at each grid point and draw the seismic hazard curves. The results presented in this study will provide the basis for the preparation of seismic risk maps, the estimation of earthquake insurance premiums, and the preliminary site evaluation of critical facilities.

Sign in / Sign up

Export Citation Format

Share Document