China-Myanmar Geophysical Survey in the Myanmar Orogen (CMGSMO) project
In 2015, Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS), incorporating with the Myanmar Geosciences Society (MGS), implemented the China-Myanmar Geophysical Survey in the Myanmar Orogen (CMGSMO) project to explore the deep structure beneath Myanmar and understand continental subduction following continent-continent collision.
From June 2016 to February 2018, with the support of the CMGSMO project, we deployed the first portable seismic array in Myanmar. The CMGSMO seismic array contains 71 temporary seismic stations covering central Myanmar from the west to the east (21.6°N - 23.9°N and 93.1°E to 97.3°E). The array consists of a dense linear sub-array and a 2-D backbone network. The east-west trending linear sub-array is 400 km long and traverses the main tectonic units from the west of Rezua, the Myanmar-India border in the India-Burma Range (IBR) through the Central Basin (CB) and the Sagaing Fault to Hsipaw, Shan Plateau, Myanmar. A total of 38 stations with spacings of 10-15 km were deployed. The backbone network consists of 33 stations with spacings of 30-50 km covering the 250 km × 320 km region of the IBR and CB.
The 2-D backbone network and 13 stations in the east-west trending linear sub-array are equipped with Nanometrics Trillium 120PA Broadband sensors
with bandwidths from 50 Hz to 120 s, while the other stations in the linear sub-array are equipped with Güralp CMG-3ESP Broadband sensors with bandwidths from 50 Hz to 30/60 s. All stations are equipped with REF TEK 130 digital data recorders. Considering the power shortage in rural Myanmar, each station is equipped with two 60 W solar panels and a 70 Ah or 100 Ah battery depending on accessibility in the rainy season. The seismic data are collected every 3 months by the researchers of the Seismic Array Laboratory, IGGCAS and colleagues from the MGS. A total of 457 gigabytes of continuous data are collected during 18 months of observation, and these data clearly record earthquakes with low noise conditions.
Publications/manuscripts related to this project:
1. Yumei He, Tianyu Zheng*, Yinshuang Ai, Guangbing Hou, Qi-Fu Chen (2018), Growth of the lower continental crust via the relamination of arc magma, Tectonophysics, 724-725, 42-50.
2. Yi Wang, Yumei He*, Gang Lu, Lianxing Wen (2020), Seismic, thermal and compositional structures of the stagnant slab in the mantle transition zone beneath southeastern China, Tectonophysics, 775, 228208.
3. Tianyu Zheng, Yumei He*, Lin Ding, Mingming Jiang, Yinshuang Ai, Chit Thet Mon, Guangbing Hou, Kyaing Sein, Myo Thant (2020), Direct structural evidence of Indian continental subduction beneath Myanmar, Nature Communications. Accepted. Receiver functions related with this study will be available soon.
4. Chit Thet Mon, Xuan Gong, Yun Wen, Mingming Jiang, Qi-Fu Chen, Miao Zhang, Guangbing Hou, Myo Thant, Kyaing Sein, Yumei He* (2020), Insight into major active faults in Central Myanmar and the related geodynamic sources, Geophysical Research Letters, in revision. Earthquake waveforms related with this study will be available soon.
5. Yiming Bai, Xiaohui Yuan, Yumei He, Guangbing Hou, Myo Thant, Kyaing Sein, Yinshuang Ai*
(2020), Slab Break-off and Tearing beneath Myanmar Inferred from Mantle Transition Zone Structure, Journal of Geophysical Research
, in revision. Receiver functions related with this study will be available soon.
6. Yuan Ling, Tianyu Zheng*, Yumei He, Guangbing Hou (2020), Response of crustal structure to Tibetan Plateau growth and Neo-Tethys evolution in Yunnan Province, China. Submitted to Tectonophysics.