Deep long-period earthquakes generated by second boiling beneath Mauna Kea volcano
Deep long-period earthquakes generated by second boiling beneath Mauna Kea volcano
复制标题
莫纳克亚火山下二次沸腾产生的深部长周期地震
DOI:
10.1126/science.aba4798
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发表时间:
2020
期刊:
影响因子:
56.9
通讯作者:
Thomas, Amanda M.
中科院分区:
文献类型:
--
作者:
Wech, Aaron G.;Thelen, Weston A.;Thomas, Amanda M.
Deep long-period earthquakes (DLPs) are an enigmatic type of volcanic seismicity that sometimes precedes eruptions but mostly occurs at quiescent volcanoes. These earthquakes are depleted in high-frequency content and typically occur near the base of the crust. We observed a near-periodic, long-lived sequence of more than one million DLPs in the past 19 years beneath the dormant postshield Mauna Kea volcano in Hawaiʻi. We argue that this DLP sequence was caused by repeated pressurization of volatiles exsolved through crystallization of cooling magma stalled beneath the crust. This “second boiling” of magma is a well-known process but has not previously been linked to DLP activity. Our observations suggest that, rather than portending eruptions, global DLP activity may more commonly be indicative of stagnant, cooling magma.
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