Teleseismic surface waves radiated by stick-slip motion of the Whillans Ice Stream
~25 minute duration and a total seismic moment equivalent to an Mw 6.5 earthquake. Here we report on simultaneous teleseismic and GPS observations of these slip episodes. Seismic arrivals generally are most prominent at periods of 20-100 seconds and consist of three packets. Time correlation with th...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.576.7243 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea190.pdf |
| Summary: | ~25 minute duration and a total seismic moment equivalent to an Mw 6.5 earthquake. Here we report on simultaneous teleseismic and GPS observations of these slip episodes. Seismic arrivals generally are most prominent at periods of 20-100 seconds and consist of three packets. Time correlation with the GPS observations identifies the first packet with the initial rupture nucleation and the final packet with rupture termination at the grounding line. The seismic amplitudes are correlated with the spring-to-neap tidal cycle and with rupture velocity. We suggest that the Whillans slip events can be monitored using permanent seismic stations allowing us to detect changes over a longer time period than is possible with in-situ measurements. More generally, other glaciers and ice streams can be remotely monitored for fast glacial slip using seismic detection techniques. |
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