1943 Alahan Panjang earthquakes

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1943 Alahan Panjang earthquakes
Indonesia Sumatra relief location map.jpg
Bullseye1.png
UTC  time Doublet earthquake:    
 1943-06-08 20:42:46
 1943-06-09 03:06:20
ISC  event 
  899871
  899872
USGS-ANSS  
  ComCat
  ComCat
Local dateJune 9, 1943 [1]
Local time 
 03:42:46
 10:06:20
Magnitude 
  Ms 7.5 [2]
  Ms 7.8 [3]
Depth15 km (9.3 mi) [2]
10 km (6.2 mi) [3]
Epicenter 1°00′S101°00′E / 1.0°S 101.0°E / -1.0; 101.0 [1]
Areas affectedIndonesia
Max. intensity IX (Destructive) (both events) [4]
Map of the Great Sumatran Fault with labelled segments Great Sumatran Fault.png
Map of the Great Sumatran Fault with labelled segments

The 1943 Alahan Panjang earthquakes occurred on June 8 and June 9 UTC (June 9, 1943, local time) in Sumatra, then under Japanese occupation. This was an earthquake doublet (the shocks occurred at the same location on consecutive days). [5]

Contents

The first mainshock occurred on June 8 at 20:42 UTC. It ruptured the Suliti segment of the Sumatran Fault Zone. The magnitude was given as Mw 7.2, [1] or Ms 7.1. [6]

The second mainshock occurred on June 9 at 03:06 UTC. It ruptured the Sumani segment of the Sumatran Fault Zone and perhaps the northwestern part of the Suliti segment. The magnitude was given as Mw  7.5, [1] or Ms  7.4. [6]

Alahan Panjang was damaged in the earthquakes. [5] Right lateral offsets were reported near the town of Solok. [6]

Near the Sumani segment, earthquake doublets occurred repeatedly. [7] Similar earthquake doublet nearby include the earthquakes in 1926 and 2007. [8]

See also

References

  1. 1 2 3 4 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. 678. ISBN   978-0124406520.
  2. 1 2 ISC-OB Event 899871 [ IRIS ].
  3. 1 2 ISC-OB Event 899872 [ IRIS ].
  4. ↑ Martin, S. S.; Cummins, P. R.; Meltzner, A. J. (2022), "Gempa Nusantara: A Database of 7380 Macroseismic Observations for 1200 Historical Earthquakes in Indonesia from 1546 to 1950", Bulletin of the Seismological Society of America, 112 (6): 2958–2980, Bibcode:2022BuSSA.112.2958M, doi:10.1785/0120220047, hdl: 10356/166257 , ISSN   0037-1106, S2CID   253365854
  5. 1 2 Natawidjaja, D. H.; Triyoso, W. (2007), "The Sumatran Fault Zone – from Source to Hazard" , Journal of Earthquake and Tsunami , 01: 21, doi:10.1142/S1793431107000031
  6. 1 2 3 Natawidjaja, D. H. (2003), Neotectonics of the Sumatran fault and paleogeodesy of the Sumatran subduction zone (phd), Dissertation (Ph.D.), California Institute of Technology, Bibcode:2003PhDT.........7N, doi:10.7907/KBXR-5B89
  7. ↑ Nakano, M.; Kumagai, H.; Toda, S.; Ando, R.; Yamashina, T.; Inoue, H.; Sunarjo (2010), "Source model of an earthquake doublet that occurred in a pull-apart basin along the Sumatran fault, Indonesia", Geophysical Journal International , 181 (1): 141–153, Bibcode:2010GeoJI.181..141N, doi: 10.1111/j.1365-246X.2010.04511.x
  8. ↑ Aydan, Ö. (2007), A reconnaissance report on the 2007 Singkarak Lake (Solok) earthquake with and emphasis on the seismic activity of Sumatra Fault following the 2004 and 2005 great off-Sumatra earthquakes (PDF), Japan Society of Civil Engineers
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