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Southern Peru desert shattered by the great 2001 earthquake: Implications for paleoseismic and paleo-El Nin??o-Southern Oscillation records

Proceedings of the National Academy of Sciences of the United States of America

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and
DOI: 10.1073/pnas.0404320101

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Abstract

In the desert region around the coastal city of Ilo, the great southern Peru earthquake of June 23, 2001 (8.2-8.4 moment magnitude), produced intense and widespread ground-failure effects. These effects included abundant landslides, pervasive ground cracking, microfracturing of surficial hillslope materials, collapse of drainage banks over long stretches, widening of hillside rills, and lengthening of first-order tributary channels. We have coined the term "shattered landscape" to describe the severity of these effects. Long-term consequences of this landscape shattering are inferred to include increased runoff and sediment transport during postearthquake rainstorms. This inference was confirmed during the first minor postearthquake rainstorm there, which occurred in June and July of 2002. Greater amounts of rainfall in this desert region have historically been associated with El Nin??o events. Previous studies of an unusual paleoflood deposit in this region have concluded that it is the product of El Nin??o-generated precipitation falling on seismically disturbed landscapes. The effects of the 2001 earthquake and 2002 rainstorm support that conclusion.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Southern Peru desert shattered by the great 2001 earthquake: Implications for paleoseismic and paleo-El Nin??o-Southern Oscillation records
Series title:
Proceedings of the National Academy of Sciences of the United States of America
DOI:
10.1073/pnas.0404320101
Volume
101
Issue:
30
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the National Academy of Sciences of the United States of America
First page:
10878
Last page:
10883
Number of Pages:
6