期刊
NATURE GEOSCIENCE
卷 7, 期 9, 页码 677-681出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NGEO2212
关键词
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资金
- NSF CAREER grant [EAR-0956051]
- NSF Office of Polar Programs [0632230, 0632239, 0652322, 0632335, 0632136, 0632209, 0632185, 1246776, 1246712, 1419268, EAR-1063471]
- Incorporated Research Institutions for Seismology (IRIS) through ASSCAL Instrument Center at New Mexico Tech
- DOE National Nuclear Security Administration
- Directorate For Geosciences
- Division Of Earth Sciences [0956051] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0632335, 0632209, 0632136, 0632239, 1419268] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1246712, 0632185, 1246776] Funding Source: National Science Foundation
Seismic waves from distant, large earthquakes can almost instantaneously trigger shallow micro-earthquakes and deep tectonic tremor as they pass through Earth's crust(1). Such remotely triggered seismic activity mostly occurs in tectonically active regions. Triggered seismicity is generally considered to reflect shear failure on critically stressed fault planes and is thought to be driven by dynamic stress perturbations from both Love and Rayleigh types of surface seismic wave(2). Here we analyse seismic data from Antarctica in the six hours leading up to and following the 2010 M-w 8.8 Maule earthquake in Chile. We identify many high-frequency seismic signals during the passage of the Rayleigh waves generated by the Maule earthquake, and interpret them as small icequakes triggered by the Rayleigh waves. The source locations of these triggered icequakes are difficult to determine owing to sparse seismic network coverage, but the triggered events generate surface waves, so are probably formed by near-surface sources. Our observations are consistent with tensile fracturing of near-surface ice or other brittle fracture events caused by changes in volumetric strain as the high-amplitude Rayleigh waves passed through. We conclude that cryospheric systems can be sensitive to large distant earthquakes.
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