Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia
Abstract Lombok is one of the islands in the transitional zone from the Sunda Arc to the Banda Arc, Indonesia. In the mid-2018, the island of Lombok was shaken by a series of strong earthquakes, started with a moment magnitude (Mw) 6.4 earthquake on July 29, 2018 followed by earthquakes on August 5...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-01-01
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| Series: | Geoscience Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40562-022-00258-3 |
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| author | Annisa Trisnia Sasmi Andri Dian Nugraha Muzli Muzli Sri Widiyantoro Syuhada Syuhada Faiz Muttaqy Zulfakriza Zulfakriza Shengji Wei Awali Priyono Haunan Afif Pepen Supendi Yayan Mi’rojul Husni Billy S. Prabowo Achmad Fajar Narotama Sarjan |
| author_facet | Annisa Trisnia Sasmi Andri Dian Nugraha Muzli Muzli Sri Widiyantoro Syuhada Syuhada Faiz Muttaqy Zulfakriza Zulfakriza Shengji Wei Awali Priyono Haunan Afif Pepen Supendi Yayan Mi’rojul Husni Billy S. Prabowo Achmad Fajar Narotama Sarjan |
| author_sort | Annisa Trisnia Sasmi |
| collection | DOAJ |
| description | Abstract Lombok is one of the islands in the transitional zone from the Sunda Arc to the Banda Arc, Indonesia. In the mid-2018, the island of Lombok was shaken by a series of strong earthquakes, started with a moment magnitude (Mw) 6.4 earthquake on July 29, 2018 followed by earthquakes on August 5 (Mw 7.0), August 9 (Mw 5.9), and August 19 (Mw 6.3 and 6.9). Some researchers suggested that this phenomenon occurred due to a segmentation rupture in the northern part of Lombok Island. This study aims to obtain information on the distribution of the Lombok earthquake fault zone 2018 and also to understand the character of seismic anisotropy around the Lombok earthquake fault zone 2018 through Shear Wave Splitting (SWS) study. Splitting, or S-wave separation, occurs when the S wave passes through an anisotropic medium. The S wave is split into fast and slow S waves with almost orthogonal polarizations and has parameters such as delay time and polarization direction of the fast S wave. To determine the SWS parameters, we used a Lombok earthquake aftershock data set recorded from 4 August to 9 September 2018, using 16 seismographic stations. The steps taken to obtain the SWS parameters are event selection, windowing using short time Fourier transform, and rotation-correlation process. The results of the SWS analysis indicate that the fast polarization directions probably have a linkage with the local fault system and the fault related to the Lombok earthquake fault zone. |
| first_indexed | 2024-04-10T21:02:00Z |
| format | Article |
| id | doaj.art-4a037570d0b445e58c715916b078a10f |
| institution | Directory Open Access Journal |
| issn | 2196-4092 |
| language | English |
| last_indexed | 2024-04-10T21:02:00Z |
| publishDate | 2023-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Geoscience Letters |
| spelling | doaj.art-4a037570d0b445e58c715916b078a10f2023-01-22T12:15:48ZengSpringerOpenGeoscience Letters2196-40922023-01-0110111610.1186/s40562-022-00258-3Shear wave splitting of the 2018 Lombok earthquake aftershock area, IndonesiaAnnisa Trisnia Sasmi0Andri Dian Nugraha1Muzli Muzli2Sri Widiyantoro3Syuhada Syuhada4Faiz Muttaqy5Zulfakriza Zulfakriza6Shengji Wei7Awali Priyono8Haunan Afif9Pepen Supendi10Yayan Mi’rojul Husni11Billy S. Prabowo12Achmad Fajar Narotama Sarjan13Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungEarth Observatory of Singapore/Asian School of the Environment, Nanyang Technological UniversityGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungResearch Center for Geological Disaster, National Research and Innovation Agency (BRIN)Research Center for Geological Disaster, National Research and Innovation Agency (BRIN)Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungEarth Observatory of Singapore/Asian School of the Environment, Nanyang Technological UniversityGlobal Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungCenter for Volcanology and Geological Hazard Mitigation (PVMBG)Meteorology, Climatology, and Geophysics Agency (BMKG)Laboratory of Volcanology and Geothermal, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungLaboratory of Volcanology and Geothermal, Faculty of Mining and Petroleum Engineering, Institut Teknologi BandungFaculty of Engineering, Universitas MataramAbstract Lombok is one of the islands in the transitional zone from the Sunda Arc to the Banda Arc, Indonesia. In the mid-2018, the island of Lombok was shaken by a series of strong earthquakes, started with a moment magnitude (Mw) 6.4 earthquake on July 29, 2018 followed by earthquakes on August 5 (Mw 7.0), August 9 (Mw 5.9), and August 19 (Mw 6.3 and 6.9). Some researchers suggested that this phenomenon occurred due to a segmentation rupture in the northern part of Lombok Island. This study aims to obtain information on the distribution of the Lombok earthquake fault zone 2018 and also to understand the character of seismic anisotropy around the Lombok earthquake fault zone 2018 through Shear Wave Splitting (SWS) study. Splitting, or S-wave separation, occurs when the S wave passes through an anisotropic medium. The S wave is split into fast and slow S waves with almost orthogonal polarizations and has parameters such as delay time and polarization direction of the fast S wave. To determine the SWS parameters, we used a Lombok earthquake aftershock data set recorded from 4 August to 9 September 2018, using 16 seismographic stations. The steps taken to obtain the SWS parameters are event selection, windowing using short time Fourier transform, and rotation-correlation process. The results of the SWS analysis indicate that the fast polarization directions probably have a linkage with the local fault system and the fault related to the Lombok earthquake fault zone.https://doi.org/10.1186/s40562-022-00258-32018 Lombok earthquakeShear wave splittingFast polarization directionDelay time |
| spellingShingle | Annisa Trisnia Sasmi Andri Dian Nugraha Muzli Muzli Sri Widiyantoro Syuhada Syuhada Faiz Muttaqy Zulfakriza Zulfakriza Shengji Wei Awali Priyono Haunan Afif Pepen Supendi Yayan Mi’rojul Husni Billy S. Prabowo Achmad Fajar Narotama Sarjan Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia Geoscience Letters 2018 Lombok earthquake Shear wave splitting Fast polarization direction Delay time |
| title | Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia |
| title_full | Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia |
| title_fullStr | Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia |
| title_full_unstemmed | Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia |
| title_short | Shear wave splitting of the 2018 Lombok earthquake aftershock area, Indonesia |
| title_sort | shear wave splitting of the 2018 lombok earthquake aftershock area indonesia |
| topic | 2018 Lombok earthquake Shear wave splitting Fast polarization direction Delay time |
| url | https://doi.org/10.1186/s40562-022-00258-3 |
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