气候变化领域集成服务门户(CCPortal): Imaging the Deep Crustal Structure of Central Oklahoma Using Stacking and Inversion of Local Earthquake Waveforms

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DOI	10.1029/2020JB021368
	Imaging the Deep Crustal Structure of Central Oklahoma Using Stacking and Inversion of Local Earthquake Waveforms
	Ratre P.; Behm M.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	The southern Granite-Rhyolite province (SGRP) contains a comprehensive record of lithospheric evolution in North America. During the last decade, increased seismicity along with improved seismic monitoring in Oklahoma provided a rich catalog of local earthquakes. The source-receiver geometry of this data set is well posed to illuminate the middle and lower crust through long offset recordings of the Pg phase. We present a 3-D P-wave velocity model for central and northern Oklahoma developed through a non-standard processing scheme applied to local earthquake waveforms recorded from 2010 to 2017, focusing on the deeper crust. We employed common mid-point sorting, stacking, and inversion of Pg phases which resulted in a set of localized velocity-depth functions up to depths of 40 km. Using this methodology, we significantly increased the S/N ratio for far offset (∼200 km) local earthquake waveforms which led to the increase in depth of investigation in the final 3-D velocity model. We find high velocity (>7 km/s) lower crust throughout the investigated area which suggests a mafic lower crust. The high velocities support previously established models which state that the lower crust of the SGRP was derived from melting of older crust. We further relate shallow and middle crustal velocity anomalies to other data sets such as gravimetric and magnetic anomalies, and the spatial distribution of earthquakes. We do not find clear evidence for the existence of the Midcontinent Rift in northern Oklahoma. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	crustal structure of Oklahoma; Mesoproterozoic; seismic tomography; southern Granite-Rhyolite province
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/187095
作者单位	School of Geosciences, University of Oklahoma, Norman, OK, United States
推荐引用方式 GB/T 7714	Ratre P.,Behm M.. Imaging the Deep Crustal Structure of Central Oklahoma Using Stacking and Inversion of Local Earthquake Waveforms[J],2021,126(5).
APA	Ratre P.,&Behm M..(2021).Imaging the Deep Crustal Structure of Central Oklahoma Using Stacking and Inversion of Local Earthquake Waveforms.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Ratre P.,et al."Imaging the Deep Crustal Structure of Central Oklahoma Using Stacking and Inversion of Local Earthquake Waveforms".Journal of Geophysical Research: Solid Earth 126.5(2021).