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Message Subject The monsters wakes up ! Katla Hekla Iceland Dead Zone and rift as uniform system ! A lot of others worldwide !
Poster Handle Luisport
Post Content
Earthquake in USA on Sunday, 14 April, 2013 at 15:08 (03:08 PM) UTC.

Between 8-12 April, five earthquakes were located within or along the margins of the Newberry caldera by the Pacific Northwest Seismic Network (PNSN, www.pnsn.org). The first two occurred at 04:19 & 04:20 PDT on 04/08 and were followed over the next 20 minutes by eight smaller (and therefore unlocatable) earthquakes. "Three days later at 5:01 PDT a "low-frequency event", so-called because it lacks higher-frequency waves that are commonly observed in regular earthquakes, occurred at a depth of cc. 8 km. Finally on 04/12 two additional earthquakes occurred at 02:28 and 04:06 PDT. The largest of these five events was a M 1.2. These five events appear as orange or red (two most recent) circles in the below map-view plot. "Although these five events are nothing to get excited about, they are noteworthy because only six other earthquakes have been located within or along the margins of the Newberry caldera since the Newberry seismic network was expanded from one to nine seismic stations in the summer of 2011 (none of these events would have been detected prior to 2011).

"In addition, the 04/11 event is the first low-frequency event ever recorded in the Newberry area. Low-frequency events are not unusual at volcanoes, and when observed are commonly thought to reflect movement of fluid (water, gas, or other) through cracks. Given that there are active hot springs within the caldera, the occasional occurrence of such events should not be surprising. "An unusual feature of this low-frequency event is its depth (8 km). Since the 1980s, such "deep low-frequency events" have been seen intermittently at Mount Baker, Glacier Peak, Mount Rainier, and Mount St. Helens. At these other volcanoes the deep low-frequency events occur as part of background seismicity and have not been associated with eruptions or unrest at the surface (for more information about these type of events in the Cascades, see Nichols et al. (2011)). Although intriguing from a volcanological perspective, these events are again nothing to get excited about.
[link to hisz.rsoe.hu]
 Quoting: Luisport

Sunday, Apr 14, 2013
Newberry volcano (Oregon): earthquake swarm unusual, but not alarming [link to www.volcanodiscovery.com]
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