scholarly journals Peak Ground Acceleration and Earthquake Intensity Microzonation in Watukumpul, Pemalang Regency

2019 ◽  
Vol 3 (2) ◽  
pp. 60
Author(s):  
Urip Nurwijayanto Prabowo ◽  
Ayu Fitri Amalia ◽  
Widodo Budhi
Keyword(s):  
Peak Ground Acceleration ◽  
Spectral Ratio ◽  
Ratio Method ◽  
Earthquake Intensity ◽  
Ground Acceleration ◽  
Predominant Period ◽  
The North ◽  
Central Java ◽  
Intensity Calculation ◽  
Microtremor Measurements

Watukumpul is located in Pemalang District, Central Java, which is adjacent to the fault seismotectonic line of Baribis fault in the north and subduction area of the Eurasian and Indies-Australian plates in the south. It makes Watukumpul often experiences an earthquake. This study aimed to map the peak ground acceleration calculated using the Kanai equation and earthquake intensity calculated using Wald equations in Watukumpul. This study used historical earthquake data occurred in 1988-April 2018 from the International Seismological Center and microtremor measurements of 33 points. Microtremor data were processed using the Horizontal to Vertical Spectral Ratio method and resulted the predominant period of study area ranged from 0.13 to 0.74 s. The results showed that the study area had a PGA value of 26.93 - 63.25 gal. The intensity calculation showed that the study area has the potential for earthquake damage with an III-IV MMI scale. Keywords: Kanai, Watukumpul, Intensity, Earthquake

scholarly journals Microseismic Wave Measurements to Detect Landslides in Bengkulu Shore with Attenuation Coefficient and Shear Strain Indicator

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Muhammad Farid
Keyword(s):  
Shear Strain ◽  
Attenuation Coefficient ◽  
Peak Ground Acceleration ◽  
Amplification Factor ◽  
Spectral Ratio ◽  
Coastal Areas ◽  
Ratio Method ◽  
Ground Acceleration ◽  
Wave Measurements ◽  
Microseismic Data

<p>It has been detected that the condition of landslides that occurred in Bengkulu Shore can change the position of the shoreline. This research aimed to: (1) calculate of shear strain (γ) and attenuation coefficient (ά) value  based on microseismic data in coastal areas that experienced landslides; (2) determine the correlation between levels of landslides with  shear strain  and attenuation coefficient value (3) determine the correlation between the shear strain and attenuation coefficient value. Microseismic data were processed and analyzed quantitatively using the Horizontal to Vertical Spectral Ratio method (HVSR) to obtain the ground vibrations resonance frequency (<em>f<sub>o</sub></em>) and amplification factor (<em>A</em>). Shear strain value was calculated from the of <em>f<sub>o</sub></em>, <em>A</em> and Peak Ground Acceleration (<em>α<sub>max</sub></em>) value. Peak Ground Acceleration value was calculated based on 100-year period of recorded earthquake data.  Attenuation coefficient was calculated based on the equation (2). The results of study showed that the value of shear strain in the coastal areas varied from 1.0 × 10<sup>-4</sup> to 3.6 × 10<sup>-3</sup>,  in accordance with the conditions of landslides. The attenuation coefficient value varied from 0.005 to 0.020.  Level of landslides that occurred varied from moderate, to very severe. There was a tendency that the more severe the landslide level,  the greater the shear strain and attenuation coefficient value were.</p>

scholarly journals Microseismic Wave Measurements to Detect Landslides in Bengkulu Shore with Attenuation Coefficient and Shear Strain Indicator

2016 ◽  
Vol 1 ◽  
Author(s):  
Muhammad Farid
Keyword(s):  
Shear Strain ◽  
Attenuation Coefficient ◽  
Peak Ground Acceleration ◽  
Amplification Factor ◽  
Spectral Ratio ◽  
Coastal Areas ◽  
Ratio Method ◽  
Ground Acceleration ◽  
Wave Measurements ◽  
Microseismic Data

<p>It has been detected that the condition of landslides that occurred in Bengkulu Shore can change the position of the shoreline. This research aimed to: (1) calculate of shear strain (γ) and attenuation coefficient (ά) value  based on microseismic data in coastal areas that experienced landslides; (2) determine the correlation between levels of landslides with  shear strain  and attenuation coefficient value (3) determine the correlation between the shear strain and attenuation coefficient value. Microseismic data were processed and analyzed quantitatively using the Horizontal to Vertical Spectral Ratio method (HVSR) to obtain the ground vibrations resonance frequency (<em>f<sub>o</sub></em>) and amplification factor (<em>A</em>). Shear strain value was calculated from the of <em>f<sub>o</sub></em>, <em>A</em> and Peak Ground Acceleration (<em>α<sub>max</sub></em>) value. Peak Ground Acceleration value was calculated based on 100-year period of recorded earthquake data.  Attenuation coefficient was calculated based on the equation (2). The results of study showed that the value of shear strain in the coastal areas varied from 1.0 × 10<sup>-4</sup> to 3.6 × 10<sup>-3</sup>,  in accordance with the conditions of landslides. The attenuation coefficient value varied from 0.005 to 0.020.  Level of landslides that occurred varied from moderate, to very severe. There was a tendency that the more severe the landslide level,  the greater the shear strain and attenuation coefficient value were.</p>

scholarly journals Identifikasi Potensi Tanah Longsor Menggunakan Metode Mikrotremor Di Dusun Tegalsari Desa Ngargosari Kecamatan Samigaluh Kabupaten Kulon Progo

2020 ◽  
Vol 24 (2) ◽  
pp. 66
Author(s):  
Ayu Syahputri ◽  
Sismanto Sismanto
Keyword(s):  
Shear Strain ◽  
Peak Ground Acceleration ◽  
Spectral Ratio ◽  
Ground Acceleration

Tanah longsor adalah bencana alam yang sering terjadi di Indonesia. Banyak faktor yang menyebab tanah longsor terjadi antara lain curah hujan yang tinggi, topografi yang curam, lapisan sedimen yang tebal dan pergerakan tanah. Salah satu daerah yang sering mengalami tanah longsor adalah Kecamatan Samigaluh. Oleh karena itu, pengambilan data mikrotremor dilakukan di Dusun Tegalsaari Desa Ngargosari Kecamatan Samigaluh Kabupaten Kulon Progo Daerah Istimewa Yogyakarta untuk mengetahui nilai frekuensi dominan dan amplifikasi di daerah tersebut yang diperoleh dari metode Horizontal to Vertical Spectral Ratio (HVSR). Selanjutnya, nilai frekuensi dominan dan amplifikasi diolah untuk mengetahui indeks kerentanan seismik, ketebalan lapisan sedimen, peak ground acceleration dan ground shear strain yang digunakan untuk mengetahui daerah yang berpotensi mengalami tanah longsor. Berdasarkan hasil analisis data mikrotremor diperoleh nilai frekuensi dominan antara 2,1 Hz – 18,7 Hz, nilai amplifikasi berkisar antara 1,4 sampai 8,1, indeks kerentanan seismik antara 0,27 – 26,04 s2/cm, nilai PGA berkisar antara 81,36  – 245,42 gal, ground shear strain antara 2,39 x 10-5 – 2,30 x 10-3 dan ketebalan sedimen berkisar antara 9,06 – 89, 55 meter. Daerah dengan potensi tanah longsor yang tinggi ditentukan dengan menganalisis persebaran nilai amplifikasi, indeks kerentanan seismik, ketebalan lapisan sedimen, peak ground acceleration, dan ground shear strain sehingga diperoleh daerah yang memiliki potensi tanah longsor tinggi berada di area 16, 46, 92, 100, 101, 103, 104, 105, 113, dan 114.

scholarly journals Model Percepatan Tanah Maksimum Di Kota Manado Menggunakan Metode Donovan dan McGuire

Jurnal MIPA ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 52
Author(s):  
Guntur Pasau ◽  
Maria Daurina Bobanto ◽  
Dolfie P. Pandara
Keyword(s):  
Peak Ground Acceleration ◽  
Observation Interval ◽  
Earthquake Risk ◽  
Ground Acceleration ◽  
The North ◽  
A Value ◽  
Earthquake Hypocenter ◽  
Acceleration Analysis ◽  
Mitigation Effort ◽  
The Impact

Telah dilakukan analisis percepatan tanah maksimum gempa bumi di Kota Manado menggunakan metode Donovan dan McGuire. Kota Manado merupakan bagian dari lengan utara Pulau Sulawesi terletak pada batas pertemuan beberapa lempeng besar sehingga wilayah ini sangat rawan akan goncangan gempa bumi. Upaya mitigasi perlu dilakuakn sejak dini untuk memperkecil dampak resiko gempa bumi tersebut. Salah satu upaya mitigasi adalah memetakan percepatan tanah maksimum (peak ground acceleration) di permukaan. Penentuan variasi nilai percepatan tanah maksimum menggunakan metode Donovan dan metode McGuire. Data yang digunakan adalah data hypocenter gempa yang dikumpulkan dari dua katalog yakni data USGS dan ANSS selama selang pengamatan Februari 1963 sampai Agustus 2017 meliputi radius 500 km dari Kota Manado. Hasil analisis menunjukkan bahwa percepatan tanah maksimum di Kota Manado menggunkan metode Donovan sekitar 42.12 gal sampai dengan 51.82 gal sedangkan metode Mc Guire diperoleh nilai percepatan tanah sekitar 59.13 gal sampai 72.53 gal.The peak ground acceleration analysis in Manado city has been done using Donovan and McGuire method. Manado City is part of the north arm of Sulawesi Island located at the boundary of several major plate meetings so that this region is very prone to earthquake shocks. Mitigation efforts need to be done early to minimize the impact of the earthquake risk. One mitigation effort is to map the peak ground acceleration on the surface. Determination of peak ground acceleration variation using the Donovan and McGuire method. The data used are earthquake hypocenter data collected from two catalogs namely USGS and ANSS data during the observation interval February 1963 to August 2017 covering a radius of 500 km from Manado City. The result of the analysis shows that the peak ground acceleration in Manado City uses Donovan method about 42.12 gal up to 51.82 gal while Mc Guire method obtained the peak ground acceleration a value of  about 59.13 gal to 72.53 gal.

scholarly journals Analisis Pengaruh Nilai Peak Ground Acceleration (PGA) Terhadap Story Shear Bangunan Bertingkat

2018 ◽  
Vol 9 (2) ◽  
pp. 1
Author(s):  
Ahmad Hamidi
Keyword(s):  
Coastal Area ◽  
Peak Ground Acceleration ◽  
Dynamic Method ◽  
Response Spectrum ◽  
Earthquake Intensity ◽  
Ground Acceleration ◽  
Spectrum Response

This study aims to analyze and examine the effect of peak land acceleration value (PGA) on shear story using dynamic method of response spectrum. The PGA value and the spectrum response used are the spectrum responses issued by the PU ministry. The review is soft land in the citys in Riau. The results showed that the higher the story shear value, the higher the PGA value in each region. The areas with the highest inner and PGA grades are Pasir Pangarian (Rohul) and the lowest is Kota Selat Panjang (Meranti District). This is because the area of Rohul Regency is an area close to West Sumatera Province that has a high enough earthquake intensity when compared with Meranti Regency which is a coastal area located on the lower plains.

scholarly journals ANALISA TINGKAT BAHAYA DAN KERENTANAN BENCANA GEMPA BUMI DI WILAYAH NUSA TENGGARA TIMUR (NTT)

2017 ◽  
Vol 18 (1) ◽  
pp. 32 ◽  
Author(s):  
Ni Made Rysnawati ◽  
I Ketut Sukarasa ◽  
Ida Bagus Alit Paramarta
Keyword(s):  
Population Density ◽  
Peak Ground Acceleration ◽  
Earthquake Hazard ◽  
High Population Density ◽  
Vulnerability Factors ◽  
Ground Acceleration ◽  
The North ◽  
Two Factors ◽  
Back Arc ◽  
Very High

East Nusa Tenggara is a region in Indonesia which included in the category of hazard prone to earthquakes, because it is flanked by two earthquakes zones, (subduction zone at the south and back arc trust in the north). It is also vulnerable to earthquake disasters because of high population density. These conditions would threaten the safety of lives and property of the population, so it needs to be research to analyze the level of earthquake hazard and vulnerability in East Nusa Tenggara. For identification of the level of hazard and the vulnerability of the earthquake in this study using two factors: the danger factor with indicator Peak Ground Acceleration, vulnerability factors with indicators of population density districts in East Nusa Tenggara. The calculation of the value of PGA use attenuation function of Fukushima and Tanaka. From the calculation of the data obtained that has a very high earthquake hazard is in Ende and Alor district, while the district has a very high risk of vulnerability is in Sikka, Sumba Barat Daya and Sabu Raijua.  

scholarly journals Analisis Ground Motion di Selatan Gunung Api Ungaran Berdasarkan Mikrozonasi Metode Horizontal to Vertical Spectral Ratio (HVSR)

2021 ◽  
Vol 4 (3) ◽  
pp. 134-141
Author(s):  
Muhammad Khemal Amrullah ◽  
Maulana Rizki Aditama ◽  
Fx Anjar Tri Laksono ◽  
Asmoro Widagdo
Keyword(s):  
Ground Motion ◽  
Peak Ground Acceleration ◽  
Spectral Ratio ◽  
Ground Acceleration

Salah satu mitigasi bencana yang dapat dilakukan untuk mengidentifikasi daerah yang berpotensi mengalami pergerakan tanah adalah analisis mikrotremor dengan metode Horizontal to Vertical Spectral Ratio (HVSR) yang menghasilkan parameter frekuensi dominan dan amplifikasi. Kedua data tersebut digunakan untuk mencari nilai indeks kerentanan seismik, ketebalan lapisan sedimen, dan peak ground acceleration yang dijadikan sebagai parameter untuk dianalisis dalam mengidentifikasi daerah yang berpotensi mengalami pergerakan tanah. Pada daerah penelitian nilai indeks kerentanan seismik terendah 0,15 s2/cm dan tertinggi 33,74 s2/cm, ketebalan sedimen paling tipis pada Vs 175 m/s adalah 3,24 m dan ketebalan lapisan sedimen paling tebal adalah 33,71 m, sedangkan pada Vs 350 m/s ketebalan paling tipis adalah 6,48 m dan ketebalan sedimen paling tebal adalah 67,43 m, serta nilai peak ground acceleration paling tinggi  adalah 48,48 gal dan paling rendah adalah adalah 14,91 gal. Berdasarkan analisis data microtremor, nilai indeks kerentanan seismik, lapisan sedimen, depth of boundary, dan peak ground acceleration, daerah yang memiliki potensi pergerakan tanah yang relatif tinggi berada di titik MS12, MS14, MS15, MS20, MS21, dan MS23.

scholarly journals PEMETAAN NILAI PERCEPATAN TANAH MAKSIMUM DENGAN METODE DETERMINISTIC SEISMIC HAZARD ANALYSIS DI LOKASI PEMBANGUNAN OBSERVATORIUM NASIONAL DESA BITOBE KECAMATAN AMFOANG TENGAH KABUPATEN KUPANG

2018 ◽  
Vol 3 (1) ◽  
pp. 49-53
Author(s):  
Awanda Magdalena Bessi ◽  
Hery L. Sianturi ◽  
Bernandus Bernandus
Keyword(s):  
Peak Ground Acceleration ◽  
Hazard Analysis ◽  
Spectral Ratio ◽  
Dominant Frequency ◽  
Google Earth ◽  
Empirical Equations ◽  
Hazard Map ◽  
Ground Acceleration ◽  
Recording Time ◽  
Map Data

ABSTRAK Penelitian menggunakan metode HVSR (Horizontal to Vertical Spectral Ratio) telah dilakukan untuk memetakan daerah yang rawan terhadap gempa bumi di Desa Bitobe. Tujuan dari penelitian ini adalah mengetahui nilai periode dominan tanah dan percepatan tanah maksimum, serta untuk membuat peta PGA dan juga peta Mikrozonasi. Pengambilan data dilakukan pada 45 titik dengan jarak antar titik ± 250 m dari titik satu ke titik lainnya dengan waktu perekaman selama ± 20 menit menggunakan TDS tipe 303S. Data yang diperoleh diolah menggunakan software Datapro, Geopsy, Surfer 13, dan Google Earth. Hasil pengolahan data diperoleh nilai frekuensi dominan (). Parameter ini digunakan untuk meghitung nilai PGA menggunakan persamaan empiris Kanai dengan data katalog gempa bumi dari tahun 1966-2016. Metode Mc.Guirre dan Esteva hanya menggunakan data katalog gempa saja dalam menghitung PGA. Berdasarkan hasil penelitian, didapatkan bahwa nilai frekuensi dominan berkisar antara 0,273 Hz – 17,887 Hz. Nilai percepatan tanah maksimum berdasarkan persamaan empiris Kanai berkisar antara 32,319 gal – 261,178 gal, Mc.Guirre berkisar antara 128,215 gal – 134,862 gal dan Esteva berkisar antara 147,359 gal – 156,007 gal. Hasil dari ketiga persamaan ini memiliki perbedaan dengan peta hazard gempa Indonesia. Kata kunci: HVSR, Mikrozonasi, Kanai, Mc.Guirre, Esteva, Bitobe ABSTRACT The research using HVSR (Horizontal to Vertical Spectral Ratio) has been carried out to map the disturb areas to earthquakes in Bitobe village. The aims of this research are to determine the values of soil dominant frequency and the peak ground acceleration than make PGA map and also microzonation map. Data were collected at 45 points with the distance between points ± 250 meters from one point to the other with ± 20 minutes of recording time used TDS 303S type. The data were processed using software Datapro, Geopsy, Surfer 13, and Google Earth. The result of data processing was dominant frequency value (). This parameter was used to calculate the peak ground acceleration with Kanai empirical equations. The earthquakes catalog data were used from 1966-2016. Mc.Guirre and Esteva method only used the earthquakes catalog data to calculated the PGA. According to this research, it was obtained that the values of the dominant frequency was about 0,273 Hz – 17,887 Hz. The values of peak ground acceleration based on Kanai empirical equations about 32,319 gal – 261,178 gal, Mc.Guirre about 128,215 gal – 134,862 gal and Esteva about 147,359 gal – 156,007 gal. The result of this third equations have different with the earthquakes hazard map of Indonesia. Key Words: HVSR, Microzonation, Kanai, Mc.Guirre, Esteva, Bitobe

scholarly journals Kajian Nilai Percepatan Puncak di Daerah Kulon Progo Utara, Yogyakarta, Indonesia, Berbasis Peta Gempa Nasional 2017 dan Pengukuran Mikrotremor

POSITRON ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 69
Author(s):  
Eddy Hartantyo ◽  
Novia Nurul Khayati ◽  
Rusnianti Nur ◽  
Skolastika Novita
Keyword(s):  
Peak Ground Acceleration ◽  
Spectral Ratio ◽  
Ground Acceleration

Daerah Kulon Progo bagian utara memiliki morfologi perbukitan batuan lapuk dengan banyak kejadian longsor. Terdapat 16 titik wisata di daerah ini, sehingga sangat penting untuk dilakukan kajian resiko bencana longsor. Salah satu data cukup penting dalam perhitungan empiris adalah kajian nilai peak ground acceleration (PGA)/nilai percepatan puncak lokal di permukaan. PGA dihitung menggunakan kombinasi pengukuran mikroseismik dan peta PGA di batuan dasar untuk berbagai skenario deterministik maupun probabilistik. Sebanyak 78 data mikroseismik yang tersebar dengan pusat Desa Gerbosari dan sekitarnya diukur menggunakan Lennartz 1 Hz dengan sampling perekaman 100 Hz selama masing-masing 40-45 menit. Data diproses menggunakan  modul horizontal to vertical spectral ratio (HVSR) di Geopsy. Hasil yang diperoleh menunjukkan bahwa 55% data merupakan clearpeak, 23% clearpeak dengan noise rendah, dan 10% noise sedang. Amplitudo amplifikasi diperoleh hingga 5 kali, terutama di sisi tenggara dan barat Desa Gerbosari. Pada daerah dengan amplifikasi tinggi tersebut diperoleh nilai PGA untuk skenario P01, P07 dan P10 masing-masing sebesar 0,8 g, 3,8 g dan minimal 5 g. Daerah dengan nilai PGA dan amplifikasi tinggi bersesuaian dengan  lokasi-lokasi yang dilaporkan terjadi longsor yang dipicu oleh jenuhnya air, kemiringan lereng, dan amplifikasi goncangan, terutama yang berdekatan dengan jalan raya.

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