DOI: 10.1002/2015GL065863
论文题名: The origin of Mauna Loa's Ni¯nole Hills: Evidence of rift zone reorganization
作者: Zurek J. ; Williams-Jones G. ; Trusdell F. ; Martin S.
刊名: Geophysical Research Letters
ISSN: 0094-9237
EISSN: 1944-8968
出版年: 2015
卷: 42, 期: 20 起始页码: 8358
结束页码: 8366
语种: 英语
英文关键词: geophysics
; gravity
; Mauna Loa
; volcanology
Scopus关键词: Geophysics
; Gravitation
; Sea level
; Submarine geology
; Bouguer gravity
; Geophysical data
; Gravity anomalies
; Mass-wasting events
; Mauna Loa
; Rapid movements
; Submarine landslides
; volcanology
; Nickel
; Bouguer anomaly
; catastrophic event
; geological survey
; geophysical survey
; mass wasting
; mountain region
; rift zone
; sea level
; submarine landslide
; volcanology
; Hawaii [(ISL) Hawaiian Islands]
; Hawaii [United States]
; Hawaiian Islands
; Mauna Loa
英文摘要: In order to identify the origin of Mauna Loa volcano's Ni¯nole Hills, Bouguer gravity was used to delineate density contrasts within the edifice. Our survey identified two residual anomalies beneath the Southwest Rift Zone (SWRZ) and the Ni¯nole Hills. The Ni¯nole Hills anomaly is elongated, striking northeast, and in inversions both anomalies merge at approximately -7 km above sea level. The positive anomaly, modeled as a rock volume of ~1200 km3 beneath the Ni¯nole Hills, is associated with old eruptive vents. Based on the geologic and geophysical data, we propose that the gravity anomaly under the Ni¯nole Hills records an early SWRZ orientation, now abandoned due to geologically rapid rift-zone reorganization. Catastrophic submarine landslides from Mauna Loa's western flank are the most likely cause for the concurrent abandonment of the Ni¯nole Hills section of the SWRZ. Rift zone reorganization induced by mass wasting is likely more common than currently recognized. Key Points 100-200 ka ago Mauna Loa's SWRZ ran through the Ninole Hills Series of mass wasting events caused a geologically instantaneous reorganization of Mauna Loa's SWRZ Reorganization and rapid movement of rift zones is not uncommon; although generally unrecognized © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946601043&doi=10.1002%2f2015GL065863&partnerID=40&md5=983f61b12ca7a132d678468dd0e3fda6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8853
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth Sciences, Simon Fraser University, Burnaby, BC, Canada
Recommended Citation:
Zurek J.,Williams-Jones G.,Trusdell F.,et al. The origin of Mauna Loa's Ni¯nole Hills: Evidence of rift zone reorganization[J]. Geophysical Research Letters,2015-01-01,42(20).