6. Regional Gravity of Peru

  1. George H. Sutton,
  2. Murli H. Manghnani,
  3. Ralph Moberly and
  4. Ethel U. Mcafee
  1. L. Ocola and
  2. H. Aleman

Published Online: 17 MAR 2013

DOI: 10.1029/GM019p0067

The Geophysics of the Pacific Ocean Basin and Its Margin

The Geophysics of the Pacific Ocean Basin and Its Margin

How to Cite

Ocola, L. and Aleman, H. (2013) Regional Gravity of Peru, in The Geophysics of the Pacific Ocean Basin and Its Margin (eds G. H. Sutton, M. H. Manghnani, R. Moberly and E. U. Mcafee), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM019p0067

Author Information

  1. Instituto Geofísico Del Peru, Lima, Peru

Publication History

  1. Published Online: 17 MAR 2013
  2. Published Print: 1 JAN 1976

ISBN Information

Print ISBN: 9780875900193

Online ISBN: 9781118663592

SEARCH

Keywords:

  • Geophysics—Pacific area—Congresses;
  • Woolard, George Prior, 1908

Summary

A regional gravity anomaly map of Peru and the neighboring ocean reveals the following anomalies of regional extent: (1) a narrow negative anomaly closely following the Peru-Chile trench and reaching values of −200 mgal; (2) a positive anomaly with values up to +50 mgal trending generally along the coastal cordillera; (3) a broad anomaly with extreme values approaching −400 mgal in southern Peru. This anomaly becomes less negative and narrower towards the north. Crustal models constructed to satisfy gravity and a va ila ble seismic data show an extraordinarily thick crust underlying the Andean mountains.