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Pangandaran Earthquake and b-value Analysis for Better Understanding of Seismic Vulnerability in Java using Statistical Earthquake Data of 2002-2010 Wachidah, Siti Fauzatun; Wibawa, Agung; Ardhiansyah, Kurniawan; Syauqi, Muhammad
Journal of Physics and Its Applications Vol 7, No 4 (2025): November 2025
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/baf.%v.%i.%Y.%p

Abstract

The application of statistical methods in seismicity analysis can provide a robust description of the relationship between earthquake magnitude and frequency in each region. This statistical relationship is formulated using the Gutenberg-Richter law, which continues to be developed through empirical and analytical studies of earthquakes in many regions. This study aims to analyze two significant earthquakes that affected the island of Java in 2006: the destructive Yogyakarta earthquake on 27 May 2006 and the Pangandaran earthquake on 17 July 2006. Both events were generated by active subduction mechanisms on the southern side of the island, where earthquakes of various magnitudes occur periodically. Through a temporal and spatial analysis of the b-value, this study compares different earthquake catalogs and analyzes the seismic vulnerability of Java by calculating the deformation caused by the 2006 earthquakes. The calculated b-values from the USGS and IRISDMC earthquake catalogs are 1.38 ± 0.04 and 0.92 ± 0.01, respectively. The magnitude of completeness (Mc) values are 4.9 for the USGS catalog and 4.3 for the IRISDMC catalog. The earthquake data span from 2002 to 2010. Deformation calculations using the IRISDMC data for 2006 show that the Pangandaran earthquake resulted in a surface rupture length of 140.60 km, a rupture area of 3,235.94 km², and a displacement of 7.96 m.
Age Structure, Growth, and Mortality of Blue Swimming Crab (Portunus pelagicus Linnaeus,1758) in Banten Bay Waters Aulia, Imadiah; Khalifa, Muta Ali; Rahmawati, Ani; Syauqi, Muhammad; Wahyuningsih, Mila; Raimahua, Syifa Jihan; Akmalia, Wilda
Jurnal Biodjati Vol 8 No 1 (2023): May
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/biodjati.v8i1.22884

Abstract

Blue swimming crab (BSC) (Portunus pelagicus) is the main fisheries commodity in Banten Bay, with the highest catch of catch occurring in the west monsoon. Increased fishing efforts have reduced the catch, as indicated by a decrease in the average size of carapace width. Overfishing might influence the life cycle and population structure of the BSC. This research aims to analyze the growth and mortality of the Blue Swimming Crab in Banten Bay, especially in the west monsoon. Blue swimming crab samples were obtained from the catch of fish trap and gillnet fishermen with landing sites around the Karangantu Archipelago Fishing Port. Growth, age, and mortality were predicted based on the measurement of total carapace width and body weight. Data were analyzed using Fisat II and Microsoft Excel. The frequency distribution of carapace showed one mode class which normally was distributed consisting of only one age structure group (cohort). The relationship between carapace width and weight of males or females resulted in a slope value (b>3) and was positive allometric, indicating that both sexes had a faster weight gain than the increase in carapace width. Growth parameters resulted asymptotic length (L∞); male 176.75 mm and female 176.46 mm. The growth was relatively fast, with a growth coefficient value of more than one. The mortality showed that the fishing mortality value (F);in males was 3.47 /year and in females 2.69/year was greater than the natural mortality value (M); males 1.25/year and females 1.22/year. Blue Swimming Crabs in Banten Bay had overfished as shown by the high fishing mortality value and there were still many BSC that were caught below the legal size allowed. Thus, catches should be controlled to keep the population and for sustainable fisheries.
Dampak Keberadaan Alfamart terhadap Tingkat Pendapatan UMKM di Sekitar Pondok Pesantren Khas Kempek Cirebon Barir, Hasan; Maghfiroh, Maghfiroh; Syauqi, Muhammad; Saniyah, Nurjihan; Ma’arip, Rusydi
⁠⁠Jurnal Literasi Indonesia Vol. 2 No. 12 (2025): Jurnal Literasi Indonesia
Publisher : Sekolah Tinggi Agama Islam Kuningan

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Abstract

Perkembangan ritel modern di Indonesia, khususnya minimarket seperti Alfamart, telah menjangkau berbagai wilayah, termasuk lingkungan pondok pesantren. Kehadiran ritel modern tersebut menimbulkan dinamika baru dalam perekonomian lokal, terutama bagi pelaku usaha mikro, kecil, dan menengah (UMKM) yang selama ini menjadi penopang ekonomi masyarakat pesantren. Penelitian ini bertujuan untuk menganalisis dampak keberadaan Alfamart terhadap tingkat pendapatan UMKM di sekitar Pondok Pesantren KHAS Kempek, Kabupaten Cirebon. Penelitian ini menggunakan pendekatan kuantitatif dengan metode deskriptif. Data diperoleh melalui penyebaran kuesioner kepada 30 pelaku UMKM yang berada dalam radius ±500 meter dari gerai Alfamart. Analisis data dilakukan menggunakan statistik deskriptif untuk menggambarkan perubahan tingkat pendapatan UMKM sebelum dan sesudah keberadaan Alfamart. Hasil penelitian menunjukkan bahwa sebagian besar UMKM mengalami penurunan pendapatan setelah keberadaan Alfamart, yaitu sebesar 83,33% responden, sementara 16,67% responden menyatakan pendapatannya tetap, dan tidak terdapat UMKM yang mengalami peningkatan pendapatan. Dampak paling besar dirasakan oleh UMKM jenis warung kelontong karena menjual produk yang sejenis dengan ritel modern. Temuan ini menunjukkan bahwa keberadaan Alfamart berdampak terhadap keberlangsungan pendapatan UMKM tradisional di sekitar pondok pesantren, sehingga diperlukan upaya adaptasi dan pemberdayaan UMKM agar mampu bertahan dalam persaingan dengan ritel modern.
Dinamika Pelaksanaan Pembelajaran IPS Berdiferensiasi dalam Kelas Heterogen di MTs Manbaul Hikmah Pondok Pesantren Gedongan Alwi, Mohamad; Syauqi, Muhammad
IJTIMAIYA: Journal of Social Science and Teaching Vol 9, No 2 (2025): IJTIMAIYA: Journal of Social Science and Teaching
Publisher : Program Studi Tadris IPS Fakultas tarbiyah IAIN Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21043/ji.v9i2.34182

Abstract

This study aims to describe the implementation of differentiated learning in social studies at MTs Manbaul Hikmah, a school under the auspices of Gedongan Islamic Boarding School. Differentiated learning attempts to adapt the learning process to the needs, interests, and individual characteristics of students. This approach is important because each student has a different background, potential, and learning style. The study used a descriptive qualitative method with a focus on grade VII. Data were obtained through observation, interviews with social studies teachers, the vice principal for curriculum, and students, and supported by learning documentation. The results showed that teachers were able to adapt differentiated strategies in a heterogeneous classroom context, despite facing limitations of time, resources, and the Islamic boarding school culture that emphasizes uniformity. The novelty of this study lies in the study of the implementation of differentiated learning in the Islamic boarding school environment, contributing to the development of inclusive and contextual learning strategies in Madrasah Tsanawiyah.