1930 Pyu earthquake

1930 Pyu earthquake
Date December 4, 1930
Magnitude Mw 7.3 [1]
Depth 35 km (22 mi) [1]
Epicenter 17°58′N 96°25′E / 17.97°N 96.42°ECoordinates: 17°58′N 96°25′E / 17.97°N 96.42°E [1]
Casualties 36 deaths

The 1930 Pyu earthquake occurred on December 4 at 01:21 local time. The epicenter was located north to Bago, Burma, then part of British India. The magnitude of the earthquake was put at Mw 7.3, or Ms 7.3.[1][2]

Before the earthquake, a tremor occurred at 16:36 UTC, and its shaking was felt much milder in Yangon. 36 deaths were reported in the earthquake. The earthquake caused severe damage to Pyu, about 130 km north of Bago. Many of the masonry buildings in Pyu were wrecked.[3] The area between Nyaunglebin and Toungoo was hardest hit. Many buildings of filmsy constructions were destroyed. Many railway bridges were damaged. Many freight cars and one locomotive were derailed and turned over.[2] The intensity of this earthquake reached Rossi-Forel VIII–IX, corresponding to MM VII–IX.[4][5] This earthquake could be felt in Bangkok, Thailand, about 660 km away. It was reported that the water in the Khlong Saen Saeb was agitated violently and overflowed its banks more than once.[2][6]

This earthquake and the Bago earthquake on May 5, 1930 were both located in the area of the Sagaing Fault. The Sagaing Fault is a right-lateral strike-slip fault that accommodates much of the shear component of the highly oblique relative motion between the India Plate and the Sunda Plate. This fault influences segments of the path of the Irrawady north of Mandalay.[7] The Bago earthquake on May 5, 1930 may have triggered the 1930 Pyu earthquake.[3] The distribution of the intensities of the both earthquakes suggests that at least a 50-km long section of the Sagaing Fault between the two events of 1930 did not rupture during either of these two earthquakes.[4]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Engdahl, E. R.; Vallaseñor, A. (2002). "Global seismicity: 1900-1999". International Handbook of Earthquake & Engineering Seismology (PDF). Part A, Volume 81A (First ed.). Academic Press. p. 675. ISBN 978-0124406520.
  2. ↑ 2.0 2.1 2.2 National Geophysical Data Center / World Data Service (NGDC/WDS) Significant Earthquake Database, Boulder, CO, USA. (Available at http://www.ngdc.noaa.gov/nndc/struts/form?t=101650&s=1&d=1)
  3. ↑ 3.0 3.1 "Tectonic Geomorphology of the Southernmost Sagaing Fault and Surface Rupture Associated with the May 1930 Pegu (Bago) Earthquake, Myanmar" by H. Tsutsumi and T. Sato
  4. ↑ 4.0 4.1 "Earthquakes and slip rate of the southern Sagaing fault: insights from an offset ancient fort wall, lower Burma (Myanmar)" by Y. Wang, K. Sieh, Thura Aung, Soe Min, Saw Ngwe Khaing, and Soe Thura Tun.
  5. ↑ "Relationship between Modified Mercalli Intensity and peak ground acceleration in Myanmar" by S. Pailoplee
  6. ↑ "Seismic microzonation of the greater Bangkok area using microtremor observations" by R. Tuladhar, F. Yamazaki, P. Warnitchai, and J. Saita.
  7. ↑ "ACTIVE FAULTING AND TECTONICS OF BURMA AND SURROUNDING REGIONS" by A. Y. Le Dain, P. Tapponnier, and P. Molnar