1930 Pyu earthquake

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 estimated at Mw 7.3, or Ms 7.3.[1][2]

1930 Pyu earthquake
UTC time1930-12-03 18:51:47
ISC event907777
USGS-ANSSComCat
Local dateDecember 4, 1930
Local time01:21
MagnitudeMw 7.3 [1]
Depth35 km (22 mi) [1]
Epicenter17.97°N 96.42°E / 17.97; 96.42 [1]
Casualties36 deaths

Earthquake

Before the earthquake, a tremor occurred at 16:36 UTC, and was felt in Yangon. The earthquake struck at 18:51 UTC, causing severe damage to Pyu, located about 130 kilometres (81 mi) north of Bago. Many masonry structures in Pyu were destroyed.[3]

Damage

The area between Nyaunglebin and Toungoo was hardest hit, with 36 deaths reported. Many buildings were destroyed and the local railway was also damaged, with many freight cars and one locomotive derailed and turned over.[2] The intensity of the quake reached Rossi-Forel VIII–IX, corresponding to MM VII–IX,[4] and was felt in Bangkok, Thailand, about 660 km (410 mi) away. It was reported that the water in the Khlong Saen Saeb was agitated violently and overflowed its banks more than once.[2][5]

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.[6] The May 5 earthquake may have triggered the December 4 Pyu earthquake.[3] The distribution of the intensities of the both earthquakes suggests that at least a 50 km (31 mi) section of the Sagaing Fault between the two events of 1930 did not rupture during either of these two earthquakes.[4]

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See also

References
  1. Engdahl, E. R.; Vallaseñor, A. (2002). "Global seismicity: 1900–1999" (PDF). International Handbook of Earthquake & Engineering Seismology. Part A, Volume 81A (First ed.). Academic Press. p. 675. ISBN 978-0124406520.
  2. National Geophysical Data Center / World Data Service (NGDC/WDS) (1972), Significant Earthquake Database (Data Set), National Geophysical Data Center, NOAA, doi:10.7289/V5TD9V7K
  3. Tsutsumi, H; Sato, T (2009), "Tectonic Geomorphology of the Southernmost Sagaing Fault and Surface Rupture Associated with the May 1930 Pegu (Bago) Earthquake, Myanmar", Bulletin of the Seismological Society of America, 99 (4): 2155, Bibcode:2009BuSSA..99.2155T, doi:10.1785/0120080113
  4. Wang, Yu; Sieh, Kerry; Aung, Thura; Min, Soe; Khaing, Saw Ngwe; Tun, Soe Thura (2011), "Earthquakes and slip rate of the southern Sagaing fault: Insights from an offset ancient fort wall, lower Burma (Myanmar)" (PDF), Geophysical Journal International, 185 (1): 49–64, Bibcode:2011GeoJI.185...49W, doi:10.1111/j.1365-246X.2010.04918.x
  5. Tuladhar, Rabin; Yamazaki, Fumio; Warnitchai, Pennung; Saita, Jun (2004), "Seismic microzonation of the greater Bangkok area using microtremor observations", Earthquake Engineering & Structural Dynamics, 33 (2): 211, doi:10.1002/eqe.345
  6. Le Dain, Anne Yvonne; Tapponnier, Paul; Molnar, Peter (1984), "Active faulting and tectonics of Burma and surrounding regions", Journal of Geophysical Research, 89 (B1): 453, Bibcode:1984JGR....89..453L, doi:10.1029/JB089iB01p00453
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