A Report on Upgraded Seismic Monitoring Stations in Myanmar: Station Performance and Site Response

Thiam, Hrin Nei; Htwe, Yin Myo Min; Kyaw, Tun Lin; Tun, Pa Pa; Min, Zaw; Htwe, Sun Hninn; Aung, Tin Myo; Lin, Kyaw Kyaw; Aung, Myat Min; Cristofaro, Jason De; Franke, M.; Radman, Stefan; Lepiten, Elouie; Wolin, Emily; Hough, Susan E.

doi:10.1785/0220160168

Cited by 13 publications

(15 citation statements)

References 17 publications

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“…Despite the complex geologic setting and the high level of seismic hazards of this area, the regional‐scale seismic velocity structure beneath Myanmar remains enigmatic, mainly due to the lack of local and regional seismic waveform observations (Thiam et al, ). Former investigations on the velocity structure beneath Myanmar were primarily made using teleseismic analyses, with global‐scale resolution (Li et al, ; Obayashi et al, ; Pesicek et al, ).…”

Section: Introductionmentioning

confidence: 99%

A 3‐D Shear Wave Velocity Model for Myanmar Region

Wang

Wei

et al. 2019

JGR Solid Earth

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Myanmar is located at the eastern margin of the ongoing Indo-Eurasian collision system, has experienced a complex tectonic history and is threatened by a high level of seismic hazard. Here we develop a crustal scale 3-D seismic velocity model of Myanmar, which is not only critical for understanding the regional tectonic setting and its evolution but can also provide the foundation for a variety of seismological studies, including earthquake location determinations, earthquake focal mechanism inversions, and ground motion simulations. We use the newly deployed Earth Observatory of Singapore-Myanmar broadband seismic network and other seismic stations in and around Myanmar to study the station-based 1-D velocity structure through a joint inversion of receiver functions, H/V amplitude ratio of Rayleigh waves, and surface wave dispersion measurements. Our results reveal a highly variable crustal structure across Myanmar region, characterized by a series of N-S trending sedimentary basins, with thicknesses up to~15 km in central Myanmar and an~5-km step in the depth of the Moho across the Sagaing-Shan Scarp fault system. We interpolate our station-based 1-D velocity profiles to obtain an integrated 3-D velocity model from southern Bangladesh to Myanmar. Using three regional earthquakes located to the south, within, and north of the seismic network, we show that our proposed model performs systematically better than the CRUST 1.0 model for both Pnl waves and surface waves. Our study provides a preliminary community velocity model for the region, with further refinements and interpretations anticipated in the near future.

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Section: Introductionmentioning

confidence: 99%

A 3‐D Shear Wave Velocity Model for Myanmar Region

Wang

Wei

et al. 2019

JGR Solid Earth

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“…The Mandalay (MDY) and Myitkyina (MYI) stations have relatively large positive station corrections which suggests that the amplitudes on these stations are much lower than expected. As mentioned before,Thiam et al (2017) reported that the MDY station is located on hard-rock and has low site amplification. As for the MYI station, we do not have any information about the site condition.Even though the new ML scale for Myanmar and the Southern California scale with station corrections produced similar residuals, the ML values can be different.…”

mentioning

confidence: 72%

“…The earthquake monitoring in Myanmar dates back to 1963. The installation of the first analog seismographs was conducted in 1976 in Yangon and 1977 in Mandalay (Thiam et al, 2017).…”

Section: Seismic Monitoring In Myanmarmentioning

confidence: 99%

“…The historic overview of seismic monitoring in Myanmar and the installation of five broadband stations by the U.S. Geological Survey and DMH were explained by Thiam et al (2017). DMH is currently (January 2019) running 19 broadband seismic stations and 10 strong-motion stations that are collocated with some of the broadband stations.…”

Section: Seismic Monitoring In Myanmarmentioning

confidence: 99%

“…Most of the stations in the center of the study area have relatively small residuals except MDY, which has a station correction of -0.98 seconds. MDY is located on hard-rock (Thiam et al, 2017), which make this station tend to have faster observed travel-time. There are other stations that have relatively large station corrections (>1 second), however we do not have any information about station site condition.…”

Section: Minimum Velocity Model and Earthquake Location Testsmentioning

confidence: 99%

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Minimum 1D Velocity Model and Local Magnitude Scale for Myanmar

Shiddiqi

Tun

Ottemöller

2019

Seismological Research Letters

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Earthquake monitoring in Myanmar has improved in recent years because of an increased number of seismic stations. This provides a good quality dataset to derive a minimum 1D velocity model and local magnitude (ML) scale for the Myanmar region, which will improve the earthquake location and magnitude estimates in this region. We combined and reprocessed earthquake catalogs from the Department of Meteorology and Hydrology of Myanmar and the International Seismological Centre. Additional waveform data from various sources were processed as well. A total of 419 earthquakes were selected based on azimuthal gap, minimum number of stations, and root mean square travel‐time residuals. A set of initial seismic velocity models was derived from various seismic velocity models. These models were randomly perturbed and used as initial models in a coupled hypocenter and 1D seismic velocity inversion procedure. We compared the average mean travel‐time residuals from the initial and inverted models. The best final model showed an improvement of location standard errors compared to the old model. Furthermore, the local magnitude scale inversion for the Myanmar region was performed using 194 earthquakes having a minimum of two amplitude observations. The following ML scale was obtained ML=logA(nm)+1.485×logR(km)+0.00118×R(km)−2.77+S. This scale is valid for hypocentral distance up to 1000 km and magnitudes up to ML 6.2.

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Simulation of Broadband Ground Motions for the 2016 Mw 6.8 Chauk Earthquake

Basu,

Raghukanth

2024

Pure Appl. Geophys.

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A Report on Upgraded Seismic Monitoring Stations in Myanmar: Station Performance and Site Response

Cited by 13 publications

References 17 publications

A 3‐D Shear Wave Velocity Model for Myanmar Region

A 3‐D Shear Wave Velocity Model for Myanmar Region

Minimum 1D Velocity Model and Local Magnitude Scale for Myanmar

Simulation of Broadband Ground Motions for the 2016 Mw 6.8 Chauk Earthquake

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