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Abstract
ABSTRAK
Aktivitas seismik di wilayah Kabupaten Pekalongan dipengaruhi oleh keberadaan segmen sesar Baribis-Kendeng. Baribis-Kendeng merupakan sesar aktif yang memanjang dari barat ke timur di bagian utara pulau Jawa, sesar tersebut menyebabkan beberapa kerusakan yang diakibatkan oleh terjadinya gempa bumi. Penelitian tentang kerawanan terhadap bencana gempa bumi di kawasan ITSNU Pekalongan perlu dilakukan karena kawasan tersebut terdiri atas 3 buah bangunan bertingkat dan merupakan kawasan yang setiap hari digunakan untuk aktivitas banyak orang. Penelitian dilakukan dengan pengukuran pada 10 titik yang tersebar di kawasan ITSNU Pekalongan. Analisis frekuensi natural dan amplifikasi diolah menggunakan metode HVSR (Horizontal to Vertical Spectral Ratio), sehingga dihasilkan nilai indeks kerentanan seismik dan ketebalan lapisan lapuk di daerah penelitian. Berdasarkan hasil penelitian, pada kawasan ITSNU Pekalongan mempunyai nilai frekuensi natural sebesar 1,99 - 2,27 Hz. Nilai tersebut menunjukkan bahwa kawasan ITSNU Pekalongan termasuk dalam klasifikasi tanah tipe I jenis IV, lapisan tanah tersebut tersusun atas batuan alluvial dengan ketebalan 26 - 29,8 m yang terbentuk akibat proses sedimentasi. Jika terjadi gempa bumi, area yang paling rawan ada di antara gedung aula PCNU Kabupaten Pekalongan dan gedung perkuliahan ITSNU Pekalongan karena mempunyai indeks kerentanan seismik dan amplifikasi tertinggi.
Kata kunci: HVSR, Mikrozonasi, Pekalongan
ABSTRACT
Seismic activity in the Pekalongan Regency area is influenced by the presence of the Baribis-Kendeng fault segment. Baribis-Kendeng is an active fault that extends from west to east in the northern part of Java Island, this fault causes some damage caused by an earthquake. Research on the vulnerability to earthquakes in the ITSNU Pekalongan area needs to be carried out because the area consists of three high-rise buildings and is an area that is used every day for the activities of many people. The research was carried out by measuring 10 points spread across the ITSNU Pekalongan area. Natural frequency analysis and amplification were processed using the HVSR (Horizontal to Vertical Spectral Ratio) method, resulting in seismic vulnerability index values and weathered layer thickness in the study area. Based on the research results, the ITSNU Pekalongan area has a natural frequency value of 1.99–2.27 Hz. This value indicates that the ITSNU Pekalongan area is included in the soil classification of type I and sort IV, the soil layer is composed of alluvial rock with a thickness of 26–29.8 m, which was formed due to the sedimentation process. If an earthquake occurs, the most vulnerable area is between the Pekalongan Regency PCNU hall building and the Pekalongan ITSNU lecture building because it has the highest seismic vulnerability index and amplification.
Keywords: HVSR, Microzonation, Pekalongan
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Copyright (c) 2023 Abdul Hakim Prima Yuniarto

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References
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References
Prayoedhie S. Waspada, Jateng Berada di Jalur Patahan Gempa [Internet]. Radar Pekalongan. 2018. Available from: https://radarpekalongan.co.id/48410/waspada-jateng-berada-di-jalur-patahan-gempa/
Sari EP, Subakti H. Identification of Baribis fault – West Java using second vertical derivative method of gravity. In: AIP Conference Proceedings. Bandung: AIP Publishing; 2015.
Nguyen, N., Cipta, A., Cummins, P., & Griffin J. Indonesia’s Historical Earthquakes: Modelled examples for improving the national hazard map. In: Geoscience Australia. Canberra; 2015.
PUSGEN TPSGN. Peta Sumber dan Bahaya Gempa Indonesia. Pusat Penelitian dan Pengembangan Perumahan dan Permukiman Kementerian PUPR; 2017.
Nakamura Y. Clear identification of fundamental idea of Nakamura’s technique and its applications. In: Proceedings of the 12th world conference. 2000. p. Paper no. 2656.
Demulawa M, Daruwati I. Analisis Frekuensi Natural Dan Potensi Amplifikasi Menggunakan Metode Hvsr : Kampus 4 Universitas Negeri Gorontalo ). J Ilm Edu Res. 2021;10(1):59–63.
Maimun AK, Silvia UN, Ariyanto P. Analisis Indeks Kerentanan Seismik, Periode Dominan, Dan Faktor Amplifikasi Menggunakan Metode Hvsr Di Stageof Tangerang. J Meteorol Klimatologi dan Geofis. 2020;7(2):24–30.
Satria A, Larasati N, Lestari HSB W, Dewi IK. Analisis Mikrotremor berdasarkan Metode Horizontal To Vertical Spectral Ratio untuk Mengetahui Indeks Kerentanan Seismik Kota Jambi. J Tek Kebumian. 2020;5(2):1–6.
Syaifuddin F, Bahri AS, Lestari W, Pandu J. Microtremor study of Gunung Anyar mud volcano, Surabaya, East Java. In: The 5th International Symposium On Earth hazard And Disaster Mitigation. 2016.
Kanai K. Improved Empirical formula for Characteristics of Stray (Sic) Earthquake Motions. In: Proceedings of the Japanese Earthquake. 1996.
Condon W, Pardyanto L, Ketner K, Amin T, Gafoer S, Samodra H. Peta Geologi Lembar Banjarnegara dan Pekalongan. Bandung: Pusat Penelitian dan Pengembangan Geologi; 1996.
Wulandari V, Bahri AS. Analisis Mikrotremor untuk Evaluasi Kekuatan Bangunan Studi Kasus Gedung Perpustakaan ITS. J Sains dan Seni ITS. 2012;1(1):B55–9.
Hartati L. Pemetaan Tingkat Resiko Gempabumi Daerah Liwa dan Sekitarnya Berdasarkan Pengukuran Mikrotremor. UGM; 2014.
Setiawan Januar Herry. Mikrozonasi Seismisitas Daerah Yogyakarta dan Sekitarnya. Institut Teknologi Bandung, Bandung. ITB; 2009.
Nakamura Y. Method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. In: Quarterly Report of RTRI (Railway Technical Research Institute) (Japan). 1989. p. 25–33.
Tanjung N, Permatasari I, Yuniarto A. Mapping of weathered layer thickness and Seismic Vulnerability in Tegal using HVSR method. In: International Symposium on Physics and Applications. 2021.
Refrizon. Analisis Percepatan Tanah Maksimum dan Tingkat Kerentanan Seismik Daerah Ratu Agung Kota Bengkulu. In: Prosiding Semirata FMIPA UNILA. 2013.
USGS. Vs30 models and data [Internet]. Earthquake Hazard Program. 2022. Available from: https://earthquake.usgs.gov/data/vs30/