SGER: Heat Flux at Mount Wrangell Following the November 3, 2002 Denali Fault Earthquake

EAR-0326083麦克纳特这项研究将调查大地震和山上火山热流之间的关系。阿拉斯加州兰格尔火山。以前曾在山上观察到过热通量的变化。1964年和1979年大地震后的兰格尔。2002年11月3日德纳利断裂发生的Mw=7.9地震可能对热通量有类似或更强的影响，因为震动更强烈。需要检验的假设是，地震震动打开了冰封的北部陨石坑下方的对流通道。这反过来又使冰川融化的水更有效地循环，并且足够深，从而增加了流向冰川冰底的热流。这表现为冰量的变化，这将在2003年夏天通过摄影测量进行测量。还将在火山顶端和侧翼设立监测站，监测地震行为。就更广泛的影响而言，这项提议跨越了三个学科--火山学、冰川学和地震学--并试图为这些大致独立的调查方向之间的相互作用建立一个物理基础。两名UAF研究生将参与数据和解释，并将在Glenallen和铜矿中心社区以及兰格尔-圣彼得堡举行公开讲座。埃利亚斯国家公园游客中心。

EAR-0326083McNuttThis research will investigate the connection between large earthquakes and volcanic heat flux on Mt. Wrangell Volcano, Alaska. Changes in heat flux have previously been observed at Mt. Wrangell following large earthquakes in 1964 and 1979. The earthquake of 3 November 2002 on the Denali Fault, Mw = 7.9, may have had a similar or stronger effect on heat flux because the shaking was more intense. The hypothesis to be tested is that seismic shaking opens convective channels beneath the ice-filled North Crater. This in turn allows glacier melt water to circulate more efficiently, and deeply enough to increase heat flux to the base of the glacier ice. This shows up as a change in the ice volume, which will be measured by photogrammetry in summer 2003. Seismic behavior will also be monitored with stations on the volcano's summit and flanks. In terms of broader impacts, this proposal crosses three disciplines--volcanology, glaciology and seismology-and seeks to establish a physical basis for interactions among these generally separate lines of inquiry. Two UAF graduate students will be involved in the data and interpretations, and public lectures will be given in the Glenallen and Copper Center communities, as well as at the Wrangell-St. Elias National Park visitor center.