Earthquakes from volcanic origin: Volcano tectonic earthquake (Yuki) It was back in 2006 when the earth underneath my feet started shaking. The house, street posts, furniture, everything around me was swaying like the worlds about to collapse. And then, everything came to a stand still. Three days later, Mayon volcano erupted. As you know, not every earthquakes are caused by movement of plates. Some, like the one from my experience, were caused by magma migrating deep underneath. So, what are these volcano-caused earthquakes, and what are the processes involved to create such a phenomena? Volcano Tectonic earthquake? What is it? A volcano tectonic earthquake is an earthquake induced by the movement (injection or withdrawal) of magma. The movement results in pressure changes in the rock around where the magma has experienced stress. At some point, the rock may break or move. The earthquakes may also be related to dike intrusion and may occur as earthquake swarms. An example is the 2007–2008 Nazko earthquake swarm in central British Columbia, Canada. Other types of seismic activity related to volcanoes and their eruptions are long period seismic waves, which are from sudden sporadic movement of magma, which is blocked from moving due to a blockage. Another is a harmonic tremor, which is steady movement of magma, deep in the mantle. Okay, so what are earthquake swarms? Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey points out that an event may be on the order of days, weeks, or months. They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock. Earthquake swarms are one of the events typically preceding eruptions of volcanoes. Keep in mind that not every earthquake are from plate activity, but, nonetheless, not all are from volcanic origin. Just remember that, if you are near a volcano(even a dormant one) and an earthquake starts to occur, you have been warned. The earthquake might not be the killer, but it may be a warning of whats worse to come. Sources: en.wikipedia.org/wiki/Volcano_tectonic_earthquake en.wikipedia.org/wiki/Earthquake_swarm
Posted on: Sat, 09 Aug 2014 07:21:45 +0000
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