Sagaing Fault

The Sagaing Fault is a major fault in Burma, a mainly continental right-lateral transform fault between the Indian Plate and Sunda Plate. It links the divergent boundary in the Andaman Sea with the zone of active continental collision along the Himalayan front. It passes through populated cities of Mandalay, Yamethin, Pyinmana, the capital Naypyidaw, Toungoo and Pegu before dropping off into the Gulf of Martaban, running for a total lenght of over 1200 kilometers.[1][2]

Sagaing Fault
A pressure ridge formed along the fault, obscured by vegetation.
Coordinates21°55'06.8"N 95°59'01.6"E
CountryMyanmar
CitiesYangon, Nay Pyi Taw, Meiktila, Mandalay, Myitkyina
Characteristics
SegmentsSouthern section: Bago, Pyu, Nay Pyi Taw, Meiktila, Sagaing. Northern section: Tawma, Ban Mauk, Indaw, Mawlu, Shaduzup, Kamaing, Mogang
Length1,400 km
Displacement18-20 mm/yr (0.71-0.79 in/yr)
Tectonics
StatusActive
TypeTransform fault
MovementDextral
Age15-22 MYA

Geomorphology

The Sagaing Fault begins offshore in the Andaman Sea before passing through the central Myanmar basin. The fault has a relatively low topographical relief for most of its length compared to the Shan Scarp Fault to the west.[3]

Slip rate and displacement

The total slip rate across the Indian–Sunda Plate boundary is about 35 mm/yr, of which 18 mm/yr is accommodated by the Sagaing Fault, according to GPS data.[4] The measured maximum displacement along the fault is about 100 km, although several authors have proposed between 360 km to 400 km.[5]

Associated seismicity

See also: List of Earthquakes in Myanmar

See also

References
  1. Win, Nilar (August 25–31, 2008). "Sagaing Fault surveyed to prepare for future quakes". The Myanmar Times. Archived from the original on 2012-06-07. Retrieved 2011-04-04.
  2. Wang, Yu (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: 49–64. doi:10.1111/j.1365-246X.2010.04918.x.
  3. SOE THURA TUN, WATKINSON. "The Sagaing Fault" (PDF). Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoir.
  4. 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): 2155–2168. doi:10.1785/0120080113.
  5. "Active tectonics of Myanmar and the Andaman Sea". Myanmar: Geology, Resources and Tectonics. 48. 2017.
  6. Htoo, Thant (2019-08-07). "Govt unveils quake preparedness plan". The Myanmar Times. Retrieved 2020-08-30.
  7. National Geophysical Data Center / World Data Service (NGDC/WDS): Significant Earthquake Database. National Geophysical Data Center, NOAA (1972). "Comments for the siginificant earthquake". NOAA National Centers for Environmental Information. doi:10.7289/V5TD9V7K. Cite journal requires |journal= (help)
  8. United States Geological Survey. "M7.5 - Myanmar". earthquake.usgs.gov. Retrieved 2020-08-30.
  9. United States Geological Survey. "M8.0 - Myanmar". earthquake.usgs.gov. Retrieved 2020-08-30.
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