Seasonality and Increasing Frequency of Greenland Glacial Earthquakes-Reference-Cited by-同舟云学术

Seasonality and Increasing Frequency of Greenland Glacial Earthquakes

Published:2006-03-24 Issue:5768 Volume:311 Page:1756-1758
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Ekström Göran¹²,Nettles Meredith¹²,Tsai Victor C.¹²

Affiliation:

1. Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, MA 02138, USA.

2. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.

Abstract

Some glaciers and ice streams periodically lurch forward with sufficient force to generate emissions of elastic waves that are recorded on seismometers worldwide. Such glacial earthquakes on Greenland show a strong seasonality as well as a doubling of their rate of occurrence over the past 5 years. These temporal patterns suggest a link to the hydrological cycle and are indicative of a dynamic glacial response to changing climate conditions.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference22 articles.

1. The global seismographic network surpasses its design goal

2. Glacial Earthquakes

3. Bull. Seismol. Soc. Am.

4. Seismograms from the glacial earthquakes are predicted poorly by standard faulting models in which the earthquake source is represented by a moment tensor or a double-couple force system. The seismic data are explained well by a single-force system like that used to describe landslide sources ( 2 8 ).

5. Initial detections and locations of the glacial earthquakes are obtained by array analysis of continuous seismic data ( 1 ) using a set of globally distributed test locations that allows for earthquake epicenters to be determined on a 0.5° by 0.5° grid. The quality of each detection and location is assessed based on the correlation between the observed signal envelope and that predicted for the selected location ( 2 3 ). Only events with high-quality detections are discussed in this report.

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