Several
months after we return home, another team will report in the journal Nature that these twice - daily ice
quakes measure a staggering magnitude 7 — strong enough to topple cities and kill thousands if they were to happen in a populated area.
Detecting glacialquakes is important because glaciers appear to accelerate
after large calving events.2 The frequency of glacialquakes — which has been rising since the late 1990s — has increased particularly since 2002.3 In fact, the number of
quakes in 2005 was twice that of 2001.1 In late summer of 2005, glacial seismic activity was almost five times greater than in the winter
months — most likely owing to seasonal changes in temperature.1, 3