The regional moment tensor of the 5 May 2014 Chiang Rai earthquake (Mw = 6.5), Northern Thailand, with its aftershocks and its implication to the stress and the instability of the Phayao Fault Zone

Noisagool, Sutthipong; Boonchaisuk, Songkhun; Pornsopin, Patinya; Siripunvaraporn, Weerachai

doi:10.1016/j.jseaes.2016.06.008

Cited by 13 publications

(20 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To improve the spatial coverage of the region, we also include 22 IRIS broadband stations (station name and operation period can be found in Table S1 in the supporting information) in and around Myanmar. Some of these stations have been used in previous studies to obtain 1 ‐ D velocity structures beneath the stations (Bai et al, ; Hu et al, ; Mitra et al, ; Noisagool et al, ; Singh et al, ); we compare these with our results for verification and discussion (see section ). As shown in Figure , the average station spacing (~150 km) is too coarse to apply modern array processing techniques, such as crustal‐scale RF common‐conversion‐point stacking (Zhu, ).…”

Section: Seismic Station Configuration and Sensor Misorientationmentioning

confidence: 67%

“…Our preferred velocity model indicates a smooth Moho, where the transition of shear wave speeds from 3.7 to 4.5 km/s take place across a depth range of 10 km with an average depth of 25 km (Figure a). In Figure c, we plot our joint inversion model together with the models derived from other RF waveform inversions (Bai et al, ; Hu et al, ; Noisagool et al, ). Overall, our model is consistent with previous studies, except at shallow depths (5–10 km), where our preferred velocity model shows a slightly lower shear wave speed (~2.7 km/s) than the other models (~3.1 km/s).…”

Section: Discussionmentioning

confidence: 99%

“…The H/V ratio and SWD measurements are sensitive to a larger volume of structure around the seismic station (Maupin, ), in contrast to higher‐frequency body waves, which are sensitive to the structure along the raypath. To further understand the contribution of the H/V ratio and SWD in the inversion, we calculate the theoretical H/V ratio and SWD using the velocity models from Bai et al (), Hu et al (), and Noisagool et al () and compare them with the observations. As shown in Figure S16a, the joint inversion can fit the data much better than those models, indicating that the H/V ratio and SWD bring important constrains to the velocity structure beneath the station.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

A 3‐D Shear Wave Velocity Model for Myanmar Region

Wang

Wei

et al. 2019

JGR Solid Earth

View full text Add to dashboard Cite

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.

show abstract

Section: Seismic Station Configuration and Sensor Misorientationmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A 3‐D Shear Wave Velocity Model for Myanmar Region

Wang

Wei

et al. 2019

JGR Solid Earth

View full text Add to dashboard Cite

show abstract

“…The western boundary of CDRB is the RRF while the eastern boundary is the XJF. [9]; Metcalfe [10]; Tun et al [17]; Noisagool et al [18]). …”

Section: Geological Settingsmentioning

confidence: 99%

“…The average slip rate of the NMF was 0.6-2.4 mm/y [61]. Strong earthquakes above Ms.5 have occurred for several times around these faults [18,62], indicating a strong tectonic movement in this region. The shallow CPD is probably caused by the strike slip movement of these faults.…”

Section: Cpd Versus Geological Structurementioning

confidence: 99%

Curie Point Depth from Spectral Analysis of Magnetic Data in the Southeast Tibet

Yang¹

2017

EARTH

View full text Add to dashboard Cite

Abstract:The satellite magnetic anomalies are used to calculate the Curie point depth of the Southeast Tibet by spectral analysis method in the study. The relationship between the Curie point depth and the regional faults or heat flow will be discussed. The results show that the Curie point depth of the study area ranges from 15 km to 36 km and the average depth is 26.3 km. The Curie point depth is cluster-like on the north of the Ailaoshan-Red River Fault, while it is strip-like distribution on the north side. The Curie point depth in the Xiaojiang Fault zone, the Xiaojinhe Fault zone, the Dien Bien Phu Fault zone and the Gaoligong Fault zone are shallow. It could be related to their strong frictional heat induced by these faults. The Curie point depth in the middle Sukhothai Block is shallow, which it is not only related to the Phayao Fault, the Mae Chan Fault and the Nam Ma Fault, but also to the subduction of the Palaeo-Tethys into the Indochina Block. There is a negative but nonlinearly correlation between the heat flow and the Curie point depth in this study area. The areas of low heat flow value correspond to the areas of deep Curie point depth. However, both the high and low heat flow values can be found in the areas of shallow Curie point depth. The possible reason is thought to be related to the low thermal conductivity of the rock.

show abstract

Seismotectonics of the 2014 Chiang Rai, Thailand, earthquake sequence

et al. 2017

View full text Add to dashboard Cite

On 5 May 2014, a Mw 6.2 strike‐slip earthquake occurred in the Mae Lao region of Chiang Rai province in Thailand. This earthquake took place in a region of known faults and caused substantial damage and injuries, although the region had been previously identified as having a relatively low earthquake hazard. Detailed field reconnaissance and deployment of a dense, temporary, network of broadband seismometers allowed details of the damage and its relationship to seismicity to be analyzed. The aftershock sequence associated with this main shock occurs on two well‐defined trends, reflecting the two potential fault planes in earthquake mechanisms for the main shock and the majority of the aftershocks. The damage area was relatively large for an event of this magnitude, but building damage was largely limited to the primary rupture region, while liquefaction and other ground failure are spatially associated with the rupture area and along regional rivers. Stress modeling, combined with the time series and pattern of aftershock activity, leads us to propose that slip near the northern termination of the main shock rupture continued slightly onto a conjugate fault, helping to trigger the distinct pattern of two discrete, conjugate trends of aftershock activity that mirror the kinematics of the main shock fault mechanism.

show abstract

The regional moment tensor of the 5 May 2014 Chiang Rai earthquake (Mw = 6.5), Northern Thailand, with its aftershocks and its implication to the stress and the instability of the Phayao Fault Zone

Cited by 13 publications

References 54 publications

A 3‐D Shear Wave Velocity Model for Myanmar Region

A 3‐D Shear Wave Velocity Model for Myanmar Region

Curie Point Depth from Spectral Analysis of Magnetic Data in the Southeast Tibet

Seismotectonics of the 2014 Chiang Rai, Thailand, earthquake sequence

Contact Info

Product

Resources

About