气候变化领域集成服务门户(CCPortal): Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA

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DOI	10.1029/2020JB019768
	Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA
	Pierdominici S.; Millett J.M.; Kück J.K.M.; Thomas D.; Jerram D.A.; Planke S.; Haskins E.; Lautze N.; Galland O.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Knowledge of the in situ stress state of the Earth's crust plays a key role in understanding geological processes including plate tectonics, earthquakes, slope failure, and igneous emplacement. In this paper, we determine the in situ stress orientation from the PTA2 borehole on the island of Hawai'i, drilled into a lava flow dominated sequence between Mauna Kea and Mauna Loa. High-resolution acoustic images were collected from the open hole interval 886 m to 1,567 m. Based on identification of 371 borehole breakouts for a total length of 310 m, the mean orientation of the minimum horizontal principal stress is N106° and remains constant across different volcanic rock fabrics. Changes in borehole breakout shape are linked to the different strength of volcanic facies and intra-facies. The orientation of the present-day stress field at Mauna Kea deviates from the plate forces and regional tectonic stress field. We interpret the compressive stress regime at the PTA2 site as resulting from the competing gravitational fields of the large topographic highs of Mauna Kea and Mauna Loa. Our study reveals that the mass accumulation associated with shield volcano growth imparts significant local variations to the subsurface stress state on volcanic islands consisting of overlapping shield volcanoes. The results have significant implications for stress accumulation leading to brittle failure and flank collapse, along with potentially influencing magma accumulation and ascent pathways during volcanic island evolution. This study provides the first insights into the orientation of the present-day stress field between the major island forming shield volcanoes of Hawai'i. ©2020. The Authors.
英文关键词	borehole breakout; Hawaii; Mauna Kea; present-day stress field; USA; volcano
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187721
作者单位	Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany; Volcanic Basin Petroleum Research (VBPR), Oslo, Norway; Department of Geology and Geophysics, University of Aberdeen, Aberdeen, United Kingdom; Hawai'i Institute of Geophysics and Planetology, University of Hawai'i at Manoa, Honolulu, HI, United States; Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway; DougalEARTH Ltd., Solihull, United Kingdom; University of Hawai'i at Hilo, Center for Study of Active Volcanoes (CSAV), Hilo, HI, United States; NJORD Center, Department of Geosciences, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Pierdominici S.,Millett J.M.,Kück J.K.M.,et al. Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA[J],2020,125(8).
APA	Pierdominici S..,Millett J.M..,Kück J.K.M..,Thomas D..,Jerram D.A..,...&Galland O..(2020).Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Pierdominici S.,et al."Stress Field Interactions Between Overlapping Shield Volcanoes: Borehole Breakout Evidence From the Island of Hawai'i, USA".Journal of Geophysical Research: Solid Earth 125.8(2020).