PENENTUAN STRATIGRAFI KECEPATAN GELOMBANG GESER (VS) DI DAERAH RAWAN ABRASI KABUPATEN BENGKULU UTARA MENGGUNAKAN METODE MULTICHANNEL ANALYSIS OF SURFACE WAVE (MASW)
Weak subsurface rock structures are thought to be one of the factors causing high abrasion rates in North Bengkulu Regency. This subsurface rock structure is estimated based on the analysis of shear wave velocity (Vs) from the measurement of Multichannel Analysis of Surface Wave (MASW) at 20 points along the coastline. Vs values are interpreted in the form of 1D and 2D profiles to illustrate the structure and type of constituent material in each depth and layer. The results of the analysis show that the stratigraphy of the subsurface Vs value in abrasion-prone areas of North Bengkulu consists of three layers of rock. The first layer with a value of Vs<180 m/s indicated to be dominated by soft clay, the second layer 180<Vs<360 m/s was dominated by rigid soil and the third layer 360<Vs<760 m/s indicated dominated by very dense soil and soft rock. Composition of rocks consists of deposits of sand, gravel, clay, and alluvium which have a low density and vary in each depth. There were no indications of hard rock to a depth of 30 meters, only soft-structured rocks that were very easily cracked and brittle. These results indicate that the subsurface rock structure in the abrasion-prone areas of North Bengkulu is a weak structural rock that is susceptible to deformation such as crack, settlement, and collapse like the abrasion phenomenon that has occurred so far.
CEN., 2004, Eurocode 8-design of Structures for Earthquake Resistance. Part 1: general rules, seismic actions and rules for buildings. European Standard EN 1998-1, Desember 2004, European Committee for Standardization, Brussles.
Farid, M., and Suryanto, W., 2016, Microseismic Wave Measurements to Detect Landslides in Bengkulu Shore with Attenuation Coefﬁcient and Shear Strain Indicator, KnE Engineering, 2016, 7, DOI: 10.18502/2016/keg.v1i1.477.
Farid, M., Brotopuspito, S, K., Wahyudi., Sunarto., Suryanto, W., 2014, Ground Shear Strain and Rate of Erosion in The Coastal Area of North Bengkulu, Indonesia. Advanced Materials Research, 896, 521-524, Trans Tech Publications, Switzerland. doi: 10.4028/www.scientific.net/AMR.89 6.521
Farid, M., Brotopuspito, S, K., Wahyudi., Sunarto., Suryanto, W., 2013, The Relationships Among Ground Shear Strain, Shore Characteristics And Abrasion On The West Coast Of Bengkulu Province, Indonesia, Caspian Journal of Applied Sciences Research, 2(AICCE'12 & GIZ' 12), 424-430, ISSN: 2251-9114, CJASR.
Mase, L. Z. 2018. Seismic Response Analysis Along the Coastal Area of Bengkulu During the September 2007 Earthquake. Makara Journal Technology. 22/1 (2018), 37-45
Mase, L. Z., 2017, Liquefaction Potential Analysis Along Coastal Area of Bengkulu Province due to the 2007 Mw 8.6 Bengkulu Earthquake, J. Eng. Technol. Sci, ITB Journal Publisher, 49, 6, 2017, 721-736, ISSN: 2337-5779
Motazedian, D., Hunter, J.A., Pugin, A., Crow, H., 2010, Development Of A Vs30(NEHRP) Map For The City Of Ottawa, Ontario, Canada. NRS Research Press, Canada.
National Earthquake Hazard Reduction Program (NEHRP), 1998, Recommended Provisions for Seismic Regulation for New Buildings and other Structures 1997 edition. Technical Report, FEMA 302, Federation Emergency Management Agency, Washington.
Park, C. B., Miller, R. D., and Xia, J., 1998, Multi-channel analysis of surface waves using Vibroseis (MASW): 66th Ann. Internat, Mtg., Soc. Expl. Geophys., Expanded Abstracts, 68- 71.
Samdara, R., and Lubis, A.M., 2016, Shoreline Changes At Northern Coast Of Bengkulu Using PALSAR and Optic Data During 2007-2011, Journal international Engneering and Sciences.
SISTEN 1998-1:2005/oA101, 2005, Eurocode 8-design of Structures for Earthquake Resistance, Part 1: general rules, seismic actions and rules for buildings, National Annex, Slovenian Institute for Standardrization, Ljubljana.
Suwarsono, Supiyati dan Suwardi., 2011, Zonasi Karakteristik Kecepatan Abrasi Dan Rancangan Teknik Penanganan Jalan Lintas Barat Bengkulu Bagian Utara Sebagai Jalur Transportasi Vital, Makara Teknologi: 15, 1, 31-38. Triadmodjo, B., 1999, Teknik Pantai, Beta Offset, Yogyakarta.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.