1946 Ancash earthquake

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1946 Ancash earthquake
1946 Ancash earthquake is located in Peru
1946 Ancash earthquake
UTC time1946-11-10 17:42:56
ISC event898660
USGS-ANSSComCat
Local dateNovember 10, 1946 (1946-11-10)
Magnitude7.0 Ms
Depth15-17 km
Epicenter8°24′36″S 77°32′06″W / 8.410°S 77.535°W / -8.410; -77.535Coordinates: 8°24′36″S 77°32′06″W / 8.410°S 77.535°W / -8.410; -77.535
TypeDip-slip
Areas affectedCentral Peru
Max. intensityXI (Extreme)
TsunamiNone
LandslidesNumerous
Casualties~1,400[1]

The 1946 Ancash earthquake in the Andes Mountains of central Peru occurred on November 10 at 17:43 UTC. The earthquake had a surface wave magnitude of 7.0,[2] and achieved a maximum Mercalli intensity scale rating of XI (Extreme).[3] About 1,400 Peruvians are thought to have died from the event.[1]

The quake was triggered by slippage along a normal fault at a depth of ~17.0 km with a magnitude of 6.9-7.3, as suggested by the focal mechanism. The fault was a shallow crustal structure on the South American Plate, as surface ruptures were observed with a maximum offset of 3.5 meters. This event also reactivated several older thrust faults.[4] These faults are part of the Marańón Thrust and Fold Belt, which formed in the Tertiary. The associated surface rupture of this quake ran for 21 km on the Quiches Fault; an active normal fault named after the town which suffered extensively during the quake.[1][5]

Many landslides were triggered by the very strong ground motions which was the reason for the high death toll and destruction. One of these slides completely buried the village of in Suytucocha Valley.[6]

See also[]

References[]

  1. ^ a b c Bellier, Olivier; Dumont, Jean Francois; Sebrier, Michel; Mercier, Jacques Louis (April 1991). "Geological constraints on the kinematics and fault-plane solution of the Quiches Fault Zone reactivated during the 10 November 1946 Ancash earthquake, northern Peru". Bulletin of the Seismological Society of America. 81: 468–490.
  2. ^ "Search publication for ISC event 898660". International Seismological Centre Online Event Bibliography. Retrieved 23 July 2021.
  3. ^ "Significant Earthquake Information PERU: JOCAIBAMBA,CERRO ANGASCHAJ,CERRO SILLAPATA". NGDC. Retrieved 12 Dec 2020.
  4. ^ Diane I. Doser (October 1987). "The Ancash, Peru, earthquake of 1946 November 10: evidence for low-angle normal faulting in the high Andes of northern Peru". Geophysical Journal International. 91: 57–71. doi:10.1111/j.1365-246X.1987.tb05213.x.
  5. ^ José Macharé; Clark H. Fenton; Michael N. Machette; Alain Lavenu; Carlos Costa; Richard L. Dart (2003). "Database and Map of Quaternary Faults and Folds in Perú and its Offshore Region" (Open-File Report 03-451). U.S. Geological Survey. Retrieved 28 August 2021.
  6. ^ Kampherm, Tanya Sandra. Landslides triggered by the 1946 Ancash Earthquake (Peru) and geologic controls on the mechanisms of initial rock slope failure (Dissertation). OCLC 827757776.

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