Identification of the active faults and seismotectonic zonation of Laos territory
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DOI:
https://doi.org/10.15625/2615-9783/21075Keywords:
Seismic activity, Earthquake, active fault, seismotectonic zonation, Laos, lineamentsAbstract
In this study, the main active faults in the territory of Laos were identified by analyzing the spatial relationship between the distributions of neo-tectonic faults and earthquake epicenters. The map of neo-tectonic faults was built by integrating the results of neo-tectonic faults research using geological-geomorphological data together with the lineament map obtained from remote sensing analysis. Nontectonic lineaments were eliminated by correlating the spatial distribution of the lineament field with a topographic map, DEM, and geological-geomorphological data. The earthquake data, including 4416 events in Laos and its surroundings, were collected from different sources: the International Seismological Center (ISC), the earthquakes recorded by the local seismic network in Laos, the seismic data in Vietnam, and the earthquake catalog provided by the Thailand Meteorological Department (TMD). Among these, 820 events were located using the hypocenter method, and the local network recorded the data. The magnitude conversion was applied to get a unified scale Mw. The catalog of 1617 main shocks obtained after eliminating foreshocks and aftershocks using the declustering technique was used for a spatial correlation with the neotectonic fault distribution to identify active faults. A total of 14 main active fault zones in the Laos territory were defined. Most are also seismogenic faults with Mw ≥ 5.0 occurring along their trace. Considering the characteristics of seismic activity and the active and neotectonic faults, the territory of Laos can be divided into six seismotectonic zones according to the decreasing level of seismic activity: the Western, the Northeastern Samnua, the Phongsali, the South Truong Son, the North Truong Son, and the Khorat zones. Each zone is characterized by relative homogeneity in the seismic activity and the characteristics of active and neotectonic faults.
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Ahmed M.H., Tarek A.S., Hamdy A.A., 2013. The Spatial and Genetic relation between Seismicity and Tectonic Trends, the Better Lake Area, North -East Egypt. Geoinformatics and Geostatistics: An Overview 2013.
Barry R.L., Berg E., L. Neil F., 1986. Hypocenter: An earthquake location method using centered, scaled, and adaptively damped least square. Bulletin of the Seismological Society of America, 76(3), 771–783.
Bui V.T., 2002, Some features of neo-tectonic faults in North Central Vietnam region. Ph.D. Thesis, Institute of Geological Sciences. Vietnam Academy of Science and Technology. Hanoi, 118p (in Vietnamese).
Bui V.T., Nguyen V.H., Sunlinthone O., Duangpaseuth S., Vongxaiya S., Markvilay B., 2014. Active characteristics of Sanua fault zone during Neotectinic stage. Vietnam Journal of Earth Sciences, 36(2), 97–107 (in Vietnamese with English abstract).
Bui V.T., Nguyen. V.H., Sunlinthone O., Duangpaseuth S., Vongxaiya S., Markvilay B., 2015. Characteristics of the Thakhet - Sepon active fault zone. Vietnam Journal of Earth Sciences, 37(1), 36–47 (in Vietnamese with English abstract).
Charusiri P., Kosuwan S., Lumjuan A., Wechbunthung B., 1999. Review of active faults and seismicity in Thailand. Geodesea 98 proceedings, Geol. Soc. Malaysia, Bull., 45, 653–665.
Charusiri P., Pailoplee S., Kosuwan S., Takashima I. and Rhodes B., 2022. Active fault and seismic zonation in Thailand: An empirical compilation. Bulletin of Earth Sciences of Thailand, 14(1), 11–34.
Dao V.C., 2015. Suture zones in western Indochina continent. Vietnam Petroleum exploration and exploitation Journal, 4, 28–33 (in Vietnamese).
Duong T.N., Lai H.P., Pham N.D., Chen C.H., Dinh V.T., 2021. Relationship between seismicity and active faults in Thanh Hoa province detected by the local seismic network. Vietnam Journal of Earth Sciences, 43(2), 199–219.
Feng W., Zhenhong L., John R.E., Yo Fukushima, Trevor H., Andrew S., Robert C., Zhonghuai X., 2013. The 2011 Mw 6.8 Burma earthquake: fault constraints provided by multiple SAR techniques. Geophys. J. Int., 195, 650–660.
Fenton C.H., Punya C., Spencer H.W., 2003. Recent Paleoseismic investigations in Northern and Western Thailand. Annals of Geophysics, 46(5), 957–981.
Gardner J.K., Knopoff L., 1974. Is the sequence of the earthquakes in Southern California, with aftershocks removed, Poissonian. Bulletin of Seismological Society of America, 64(5), 1363–1367.
Hanson K.L., Kelson K.I., Angell M.A., Lettis W.R., 1999. Geomatrix Consultants. Inc. 100 Pine Street, San Francisco, CA 94111, United States Nuclear Regulatory Commission. Techniques for Identifying Faults and Determining Their Origins. NUREG-5503
Haskov J., Ottemoller L., 2010. Routine Data Processing in Earthquake Seismology (with Sample Data, Exercises, and Software). Springer Science, Business Media, 337p.
Heaton T.H., Tajima F., 1986. Estimating ground motions using recorded accelerograms. Article in Surveys in Geophysics, 8, 25–83.
Huang B.S., Chen J.H., Liu Q.Y., Chen Y.G, Xu X.W, Wang C.Y., Lee S.J., Yao Z.X., 2012. Estimation of rupture processes of the 2008 Wenchuan Earthquake from joint analyses of two regional seismic arrays. Tectonophysics, 578, 87–97.
Hutton L.K., Boore D.M., 1987. The ML scale in southern California. Bulletin of the Seismological Society of America, 77(6), 2074–2094.
Masatoshi S., Metcalfe I., 2008. Parallel Tethyan sutures in mainland Southeast Asia: New insights for Palaeo-Tethys closure and implications for the Indosinian Orogen. C.R. Geoscience, 340, 166–179.
Monique T.S., Didier B., 2021. Active Faults Characterization and Seismo- tectonic zoning of the Hispaniola Island. J Seismol, 25, 499–520. https://10.1007/s10950-021- 09985.
Nguyen C.N., Huang B.S., Duong N.A., Le Q.K., Ha T.G., Van D.Q., Long H.V., Chen P.F., 2022a. Characteristics of earthquake source and ground motions in Northern Vietnam investigated through the 2020 Moc Chau M5.0 earthquake sequence. Journal of Asian Earth Sciences, 229, 105144. https://doi.org/10.1016/j. jseaes.2022.105144.
Nguyen C.N., Van D.N., Thi G.H., Le M.N., Huang B.S., Tien H.N., Le Quang K., Huu H.N., 2022b. Automatic earthquake detection and phase picking in Muong Te, Lai Chau region: an application of machine learning in observational seismology in Vietnam. Vietnam Journal of Earth Sciences, 44(3), 430–446.
Nguyen D.X., et al., 2004. Assessment of earthquake and ground motion in the territory of Vietnam. Outcome report of Vietnam National Scientific Project. Institute of Geophysics - Vietnam Academy of Science and Technology (in Vietnamese).
Nguyen H.P., Pham T.T., Nguyen T.N., 2019. Investigation of long-term and short-term seismicity in Vietnam. Journal of Seismology, 23, 951–966.
Nguyen H.P., Pham T.T., 2015. Probabilistic seismic hazard maps of Vietnam and the East Vietnam Sea. Vietnam Journal of Marine Science and Technology, 15(1), 77–90 (in Vietnamese with English abstract).
Nguyen N.T., Vu V.C., Phung V.P., 2005. Features of the main active fault zones in the Northwestern region of Vietnam. Vietnam Journal of Earth Sciences, 27(2), 169–175 (in Vietnamese with English abstract).
Nguyen T.Y., et al., 2006. Investigation and establishment of Natural Hazard Maps of Vietnam territory. The Outcome Report of the National Scientific Project named KC 08-01. Institute of Geological Sciences. Vietnam Academy of Science and Technology (in Vietnamese).
Nguyen T.Y., et al., 2014. Investigation and establishment of Natural Hazard Maps of Lao DPR. The Report of Viet - Lao Cooperation research in the framework of Viet - Lao Protocol Agreement 2011-2013. Institute of Geological Sciences - Vietnam Academy of Science and Technology (in Vietnamese).
Nguyen V.H., 2022. The major characteristics of neo-tectonic faults in Northwestern region, Ph.D. Thesis. Institute of Geological Sciences - Vietnam Academy of Science and Technology, Hanoi 135p (in Vietnamese).
Ntokos D., 2018. Neotectonic study of Northwestern Greece. Journal of Maps, 14(2), 178–188.
OCHA (United Nations Office for Coordination of Humanitarian Affairs), 2010. Earthquake Hazard Assessment in the Report: "Developing National Risk Profile of Lao PDR", 37–39.
Ornthammarat T., Warnitchai P., Worakanchana K., Zaman S., Sigbiorsson R., Lai C.G., 2010. Probabilistic seismic hazard assessment for Thailand. Bull Earthquake Eng., 9(2), 367–394. Doi: 10.1007/s105 18-010-9197-3.
Pailoplee S., Charusiri P., 2017. Analyses of seismic activities and hazards in Laos: A seismicity approach. Terr. Atmos. Ocean. Sci., 28(6), 843–853.
Pailoplee S., Choowong M., 2013. Probabilities of earthquake occurrences in Mainland Southeast Asia. Arabian Journal of Geosciences, 6, 4993–5006.
Pailoplee S., Patarak C., Vichai C., 2013. Earthquake Activities in the Thailand-Laos-Myanmar Border region: A statistical approach. Terr. Atmos. Ocean. Sci., Part II, 24(4), 721–730.
Pailpolee S., Yuichi S., Charusiri P., 2009. Deterministic and probabilistic seismic hazard analyses in Thailand and adjacent areas using active fault data. Earth Planets Space, 61, 1313–1325.
Pananont P., Herman M.W., Pornsopin P., Furlong K.P., Habangkaem S., Waldhauser F., Wongwai W., Limpisawad S., Warnitchai P., Kosuwan S., Wechbunthung B., 2017. Seismotectonics of the 2014 Chiang Rai, Thailand, earthquake sequence. Journal of Geophysical Research: Solid Earth, 122(8), 6367–6388.
Phan C.T., et al., 1991. Geology of Cambodia, Laos, and Vietnam. Published by the Geological Survey of Vietnam, Hanoi, 157p.
Phommakaysone K., 2012. The geology and mineral resources of Lao PDR, 27p. online: www.mric.jogmee.go.jp/kouenkai_index/2012/briefing_120316_3.pdf.
Scordilis E.M., 2006. Empirical global relations converting Ms and Mb to moment magnitude. J. of Seismology, 10, 225–236.
Sipkin S.A., 2003. A correction to body-wave magnitude mb based on the moment magnitude Mw. Seismological Research Letters, 2-3, 74(6), 739–742.
Tapponnier P., Peltzer G., Armijo R., 1986. On the mechanics of the collision between India and Asia. Geological Society, London. Special Publications, 19, 113–157.
Thanu H., Luddakul A., 2011. Seismic Hazard of the Khorat Plateau: Preliminary Review. International Conference on Geology, Geotechnology and Mineral Resources of Indochina (GEOINDO 2011), Khon Kaen Thailand, 457–501.
Tran V.T., Michel F., Nguyen V.V., Bui H.H., Michael B.W.F., Nguyen T.Q., Claude L., Tonny B.T., Kenichiro T., Charusiri P., 2020. Neoproterozoic to Early Triassic tectonostratigraphic evolution of Indochina and adjacent areas: A review with new data. Journal of Asian Earth Sciences, 191, 104231, 1–23.
Vamvakaris D.A., Papazachos C.B., Papaioannou C.A., Scordilis E.M., Karakaisis G.F., 2016. A detailed seismic zonation model for shallow earthquakes in the broader Aegean area. Nat. Hazards Earth Syst. Sci., 16, 55–84.
Wells L.D., Coppersmith K.J, 1994. New empirical relations among magnitude, rupture length, rupture width, rupture area, and surface displacement. Bulletin of the Seismological Society of America, 84(4), 974–1002.
Wen S., Yeh Y.L., Tang C.C., Lai H.P., Dinh V.T., Chang W.Y., Chen C.H., 2015. The tectonic structure of the Song Ma fault zone, Vietnam. Journal of Asian Earth Sciences, 107, 26–34.
Wiemer S., 2001. Software package to analyze seismicity: Zmap. Seismological Research Letters, 72(2), 373–382.
Zuchiewicz W., Nguyen Q.C., Bluszcz A., Michalik M., 2004. Quaternary Sediments in the Dien Bien Phu Fault Zone, NW Vietnam: A Record of Young Tectonic Processes in the light of OSL-SAR Dating Results. Geomorphology, 60, 269–302.
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