被动地震学:北极海底和水下永久冻土的轻量级快速探测

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Geophysical Research: Earth Surface Pub Date : 2024-09-07 DOI:10.1029/2023JF007290
Michael Angelopoulos, Trond Ryberg, Christian Frigaard Rasmussen, Christian Haberland, Bennet Juhls, Scott Dallimore, Julia Boike, Pier Paul Overduin
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引用次数: 0

摘要

上一个冰河时期的低海平面暴露了数百万平方公里的北极陆架,这些陆架随后被淹没,形成了海底永久冻土。在陆地环境中,永久冻土也可能存在于沿海泻湖、河流和热卡湖等水体之下。我们将被动地震学作为一种绘制海底和水下永久冻土上未冻结沉积厚度的方法进行了探索。我们展示了利用移动式海洋海底地震仪(MOBSI)从加拿大图克托亚克图克附近的波弗特海、拜科夫斯基半岛的伊瓦什金娜泻湖以及俄罗斯西伯利亚勒拿河三角洲的一个湖泊和河流收集到的被动地震数据。我们利用钻孔数据和霜冻探针测量来确定与永久冻土相关的 H/V 测量峰值,并校准剪切波速度以进行频率-深度转换。我们采用最短路径和最大信号振幅来连接峰值并生成地质剖面图。MOBSI 在波弗特海以及西伯利亚的一个湖泊和泻湖下面探测到了冰结合永久冻土层。在图克托亚克图克,海底地震仪显示,在三分钟的时间窗口和 8 小时的记录时间内,峰值频率的散布率为 5%。峰值频率从 4.9 ± 0.2 Hz 到 27.6 ± 1.4 Hz 不等,海底永久冻土深度从海岸线的 1.4 ± 0.1 m bsl 到离岸 240 m 的 14.0 ± 0.4 m bsl 不等。在剪切波速度准确的情况下,我们的研究结果表明,MOBSI 部署时间短至 3 分钟就足以探测北极海底和水下永久冻土。
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Passive Seismology: Lightweight and Rapid Detection of Arctic Subsea and Sub-Aquatic Permafrost

Low sea levels during the last Ice Age exposed millions of square kilometers of Arctic shelves which have been subsequently submerged, creating subsea permafrost. In onshore settings, permafrost can also exist beneath water bodies such as coastal lagoons, rivers, and thermokarst lakes. We explored passive seismology as a method for mapping unfrozen sediment thickness above subsea and sub-aquatic permafrost. We present passive seismic data collected with the Mobile Ocean Bottom Seismic Instrument (MOBSI) from the Beaufort Sea near Tuktoyaktuk in Canada, Ivashkina Lagoon on the Bykovsky Peninsula, as well as a lake and river in the Lena Delta, Siberia, Russia. We use borehole data and frost probe measurements to identify permafrost-related H/V measurement peaks and calibrate shear wave velocities for frequency-to-depth conversion. We employ the shortest path and maximum signal amplitude to connect peaks and generate geological profiles. The MOBSI detected the ice-bonded permafrost table beneath the Beaufort Sea, as well as beneath a Siberian lake and lagoon. At Tuktoyaktuk, an ocean bottom seismometer revealed a 5% scatter about the peak frequency for three-minute time windows and over 8 hr of recording time. With peak frequencies ranging from 4.9 ± 0.2 Hz to 27.6 ± 1.4 Hz, the depth to subsea permafrost ranged from 1.4 ± 0.1 m bsl at the shoreline to 14.0 ± 0.4 m bsl 240 m offshore. Given an accurate shear wave velocity, our findings highlight that MOBSI deployment times as short as 3 min are adequate for detecting Arctic subsea and sub-aquatic permafrost.

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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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