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Regional changes in streamflow after a megathrust earthquake

Journal Article · · Earth and Planetary Science Letters
 [1];  [2];  [2];  [1]
  1. Univ. of Potsdam (Germany)
  2. Univ. of California, Berkeley, CA (United States)

Moderate to large earthquakes can increase the amount of water feeding stream flows, mobilizing excess water from deep groundwater, shallow groundwater, or the vadose zone. Here we examine the regional pattern of streamflow response to the Maule M8.8 earthquake across Chile's diverse topographic and hydro-climatic gradients. We combine streamflow analyses with groundwater flow modeling and a random forest classifier, and find that, after the earthquake, at least 85 streams had a change in flow. Discharge mostly increased (n=78) shortly after the earthquake, liberating an excess water volume of >1.1 km3, which is the largest ever reported following an earthquake. Several catchments had increased discharge of >50 mm, locally exceeding seasonal streamflow discharge under undisturbed conditions. Our modeling results favor enhanced vertical permeability induced by dynamic strain as the most probable process explaining the observed changes at the regional scale. Supporting this interpretation, our random forest classification identifies peak ground velocity and elevation extremes as most important for predicting streamflow response. Given the mean recurrence interval of ~25 yr for >M8.0 earthquakes along the Peru–Chile Trench, our observations highlight the role of earthquakes in the regional water cycle, especially in arid environments.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1479293
Journal Information:
Earth and Planetary Science Letters, Journal Name: Earth and Planetary Science Letters Journal Issue: C Vol. 458; ISSN 0012-821X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Emerging Trends and New Developments in Disaster Research after the 2008 Wenchuan Earthquake journal December 2018
Fault Zone Permeability Decrease Following Large Earthquakes in a Hydrothermal System journal February 2018
Hydrology and hillslope processes explain spatial variation in tree-ring responses to the 1983 earthquake at Borah Peak, Idaho, USA: Borah Peak Earthquake Tree-Ring Responses journal August 2018
Water-table and discharge changes associated with the 2016–2017 seismic sequence in central Italy: hydrogeological data and a conceptual model for fractured carbonate aquifers journal January 2018
The Mechanics of Earthquakes and Faulting journal June 1993
The Mechanics of Earthquakes and Faulting book December 2018
The Mechanics of Earthquakes and Faulting book January 2012
Stronger Peak Ground Motion, Beyond the Threshold to Initiate a Response, Does Not Lead to Larger Stream Discharge Responses to Earthquakes journal July 2018
Suspended Sediments in Chilean Rivers Reveal Low Postseismic Erosion After the Maule Earthquake (Mw 8.8) During a Severe Drought journal June 2019
Coseismic Groundwater Drawdown Along Crustal Ruptures During the 2016 M w 7.0 Kumamoto Earthquake journal July 2019
Earthquake Hydrogeology journal July 2019
Seismological and Hydrogeological Controls on New Zealand-Wide Groundwater Level Changes Induced by the 2016 M w 7.8 Kaikōura Earthquake journal June 2019
Prospects for Imaging Terrestrial Water Storage in South America Using Daily GPS Observations journal March 2019
Prospects for Imaging Terrestrial Water Storage in South America Using Daily GPS Observations text January 2019

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