Analisis Nilai Frekuensi Natural dan Amplifikasi Desa Olak Alen Blitar Menggunakan Metode Mikrotremor HVSR

Sitorus, Nomensen M. H.; Purwanto, Singgih; Utama, Widya

doi:10.12962/j25023659.v3i2.2962

Cited by 9 publications

(11 citation statements)

References 1 publication

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“…Spektrum HVSR tidak hanya menunjukkan f0 tapi juga menginformasikan nilai amplifikasi atau A0 suatu lokasi [14]. Amplifikasi merupakan penguatan gelombang seismik yang terjadi karena adanya perubahan medium yang signifikan [15]. Analisis HVSR di Plampang menunjukkan bahwa faktor amplifikasi bervariasi mulai dari 0,3 hingga 9,8 sebagaimana dapat dilihat pada Gambar 9.…”

Section: Faktor Amplifikasiunclassified

Mikrozonasi di Daerah Plampang, Nusa Tenggara Barat

Iswanto¹,

Riyanto²,

Suntoko³

2021

EKSPLORIUM

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ABSTRAK Provinsi Nusa Tenggara Barat (NTB) merupakan daerah dengan aktivitas kegempaan yang tinggi. Fenomena ini disebabkan oleh adanya aktivitas tektonik sebagai akibat pertemuan Lempeng Eurasia-Australia (zona subduksi) di bagian selatan dan Sesar Flores di bagian utara serta adanya keberadaan sesar-sesar lokal. Terkait dengan rencana pengembangan kawasan Samota di Pulau Sumbawa, NTB, perlu dilakukan suatu kajian kegempaan. Tujuan penelitian ini adalah memetakan indeks kerentanan seismik (Kg) melalui pengukuran mikrotremor dengan analisis menggunakan metode Horizontal to Vertical Spectral Ratio (HVSR). Hasil penelitian berupa peta kerentanan seismik daerah Plampang yang menunjukkan bahwa sisi utara lokasi penelitian memiliki indeks kerentanan seismik rendah yang ditandai dengan nilai amplifikasi kurang dari tiga jika dibandingkan daerah lainnya. Geologi sisi utara lokasi penelitian tersusun oleh batuan gunung api dengan karakteristik batuan keras, ketebalan sedimen sangat tipis, dan tersusun atas batuan Tersier atau lebih tua. Peta kerentanan seismik berguna sebagai acuan dalam mitigasi gempa bumi untuk mengurangi risiko yang ditimbulkan. ABSTRACT Nusa Tenggara Barat (NTB) Province is an area with intense seismic activity. This phenomenon is caused by tectonic activity as the result of the convergency of the Eurasia-Australia Plates (subduction zone) in the south and the Flores Fault in the north as well as the presence of local faults. Regarding the plan to develop the Samota area in Sumbawa Island, NTB, a study concerning earthquakes should be done. The purpose of this study is to map the seismic vulnerability index (Kg) through microtremor measurement by using the Horizontal to Vertical Spectral Ratio (HVSR) analysis method. The result of the study is a seismic vulnerability map of the Plampang area which its northern part has a low seismic vulnerability index indicated by the amplification factor value of less than three compared to other areas. The geology of the northern part of the Plampang area consists of volcanic rocks which has hard rock characteristic, very thin sediment thickness, and composed of Tertiary or older rocks. Seismic vulnerability maps can be useful as a reference for earthquake mitigation to reduce its risks.

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Section: Faktor Amplifikasiunclassified

Mikrozonasi di Daerah Plampang, Nusa Tenggara Barat

Iswanto¹,

Riyanto²,

Suntoko³

2021

EKSPLORIUM

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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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“…Microtremor measures the natural vibrations of the ground which can come from natural sources (wind and ocean waves), as well as artificial sources (traffic, machinery, footsteps, etc.) [2]. This method continues to grow, which later Nakamura (1989) developed a method to analyze HVSR (Horizontal to Vertical Spectral Ratio).…”

Section: Introductionmentioning

confidence: 99%

“…In principle, HVSR analysis involves performing Fourier transform on microwave tremors to obtain the natural frequency and amplification values [1]. Natural frequency is the fundamental frequency of a place in spreading vibrations or waves [2] and is related to the thickness of the sediment layer [1]. Amplification is an amplification of waves that occurs when three seismic waves pass through two types of rock with different characteristics [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Analisis Nilai Frekuensi Natural dan Amplifikasi Desa Olak Alen Blitar Menggunakan Metode Mikrotremor HVSR

Cited by 9 publications

References 1 publication

Mikrozonasi di Daerah Plampang, Nusa Tenggara Barat

Mikrozonasi di Daerah Plampang, Nusa Tenggara Barat

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

Microtremor analysis around Jari mud volcano, Bojonegoro

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