Horizontal-vertical Spectral Ratio Method in Microtremor to Estimate Engineering Bedrock Thickness at Sedati Mud Volcano

Arwananda, Alif Prabawa; Aryaseta, Bagas; Dezulfakar, Hafidz; Fatahillah, Yosar; Rochman, Juan Pandu Gya Nur

doi:10.1088/1755-1315/62/1/012010

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…Sehingga frekuensi dominan yang dihasilkan, sehingga dapat merepresentasikan ketebalan lapisan dengan karakteristik sedimen lunak diatas batuan keras atau bed rock (Arwananda et al, 2017;Sitorus et al, 2017;Sutrisna, et al, 2015;Syaifuddin et al, 2016). …”

Section: Pendahuluanunclassified

Identifikasi Arah Persebaran Sedimentasi Menggunakan Analisis Mikrotremor Studi Kasus Kawasan Sumur Tua Kecamatan Wringinanom, Gresik

et al. 2018

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Abstrak. Jawa timur bagian utara merupakan daerah prospek dalam industri Minyak dan Gas Bumi. Sebagai zona RMKS (Rembang, Madura, Kangean, dan Subala). Cekungan Jawa Timur utara memiliki kerangka geologi didominasi oleh graben, half-graben, dan sesar lain akibat fase rifting pada periode ekstensional zaman Paleogen dan arah sedimentasi berawal sisi utara cekungan, seiring terbentuknya gunung api hasil subduksi lempeng dibagian selatan maka sedimen terendapkan dari bagian selatan cekungan. Secara regional terdapat potensi reservoar yang terbentuk dari batuan pasir dan karbonat. Berlatarbelakang sumur tua yang terletak di desa Sumberwaru, Kecamatan Wringinanom, Gresik. Indikasi awal daerah tersebut memiliki petroleum system sehingga, penelitian bertujuan mengidentifikasi arah persebaran sedimen dalam tinjauan awal eksplorasi kembali pada daerah tersebut. Data yang digunakan adalah data primer pengukuran metode mikrotremor berdimensi 36.000 m 2 (122 titik) selama 6 hari, dengan frekuensi natural 4-8 Hz. Kata Kunci : Mikrotremor, frekuensi, HVSR, Vs30, Wringinanom Abstract. East Java is the northern region of prospect in the Oil and Gas industry. As a zone of RMKS (Rembang, Madura, Kangean, and Subala). The northern East Java basin has a geological framework dominated by graben, half-graben and other faults due to the rifting phase of the Paleogenian period and the sedimentation direction begins on the north side of the basin, as the resulting volcanic subduction volcano in the southern part of the sediment is deposited from

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Section: Pendahuluanunclassified

Identifikasi Arah Persebaran Sedimentasi Menggunakan Analisis Mikrotremor Studi Kasus Kawasan Sumur Tua Kecamatan Wringinanom, Gresik

et al. 2018

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“…Consequently, the research solely necessitates ambient noise gathered from the study area surroundings. Moreover, this approach eliminates the need for expensive and time-consuming techniques like seismic methods [7].…”

Section: Introductionmentioning

confidence: 99%

Site classification Based on Shear Wave Velocity Inversion in The Jlantah Dam Construction Project using the HVSR (Horizontal to Vertical Spectral Ratio) Analysis Method

Rasyid,

Rochman,

Widodo

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This research was conducted with the aim to test whether the results of the inversion of the HVSR curve can be used as complementary data for N-SPT values in classifying areas according to site classification. The inversion result in the form of shear wave velocity (VS ) is then compared directly with the N-SPT data in several boreholes. Ellipticity curve method is used for inversion. The data generated in this study are dominant frequency, Amplitude Peak, and H/V curve as a result of the HVSR analysis performed on microtremor data. Furthermore, an inversion was carried out on the H/V curve by taking into account secondary data in the form of borehole, shear wave velocity, density and poisson ratio for each type of lithology. The dominant frequency value obtained has a value range of 0.33 to 17.15 Hz. The Amplitude Peak obtained in the study area has a value range of 1.81 – 11.4. The inversion (VS ) value has a range of 110.5 m/s – 400 m/s, so it is included in the classification of Soft Soil, Medium Soil, and Hard Soil and Soft Rock. The correlation of and N-SPT show that inversion method with HVSR analysis of microtremor data is quite reliable as supporting data for N-SPT. Considering cons of drilling, the method used in this study can be a new alternative for use in construction projects because it can be carried out at a relatively low cost, and is quite simple in terms of data acquisition and processing.

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“…Generally, the application of the microtremor method in the earth sector is to determine the soil vulnerability index related to earthquakes and disaster mitigation in an area. For example soil vulnerability analysis [2][4], fault zone mapping [9] and bedrock estimation [11].…”

Section: Introductionmentioning

confidence: 99%

Microtremor analysis around Jari mud volcano, Bojonegoro

Purba,

Mariyanto,

Komara

2023

J. Phys.: Conf. Ser.

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The earthquake that occurred in the Mount Pandan area in 2016 is thought to have triggered the emergence of a mudflow mixed with water and gas. The research area is in the Kendeng Zone with a complex geological structure. In this zone, there is a very fast sedimentation process so the buried material is not fully compacted. In this study, measurements were made of 6 microtremor data points around Jari Mud Volcano, Bojonegoro, East Java, Indonesia. Furthermore, the data obtained were processed using the HVSR analysis method. HVSR analysis is a method of processing microtremor signals to determine soil characteristics based on information on natural frequency values and its amplification. The result shows the natural frequency parameter and its amplification is slightly variated around Jari Mud Volcano, caused by sedimentary depth variation and/or the presence of existing rock. Based on 6 processed data, the natural frequency values range from 1.9 to 9.1 Hz. Meanwhile, the amplification value ranges from 2.6 to 4.4. Based on the amplification value, the research area is classified as low and medium amplification zones (low value dominance). This is because the amplification value is related to geomorphological conditions, in which the research area is located in the mountains and is composed of volcanic sediments.

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Horizontal-vertical Spectral Ratio Method in Microtremor to Estimate Engineering Bedrock Thickness at Sedati Mud Volcano

Cited by 7 publications

References 5 publications

Identifikasi Arah Persebaran Sedimentasi Menggunakan Analisis Mikrotremor Studi Kasus Kawasan Sumur Tua Kecamatan Wringinanom, Gresik

Identifikasi Arah Persebaran Sedimentasi Menggunakan Analisis Mikrotremor Studi Kasus Kawasan Sumur Tua Kecamatan Wringinanom, Gresik

Site classification Based on Shear Wave Velocity Inversion in The Jlantah Dam Construction Project using the HVSR (Horizontal to Vertical Spectral Ratio) Analysis Method

Microtremor analysis around Jari mud volcano, Bojonegoro

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