Feasibility of Estimating Parameters and Enhancing Reflections of Dipping Moho From Teleseismic P Wave Coda Autocorrelation

Zhou, Jinju1; Hu, Nan2,3; Hu, Yong1; Zhang, Wei2,3

2022-05-01

10.1029/2021JB023688

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   影响因子和分区

2169-9313

2169-9356

Teleseismic P wave coda autocorrelation can retrieve reflections from subsurface structural boundaries, which can be used in lithospheric imaging. However, dipping structures cause difficulty in extraction of reflections and errors in depth estimation. Based on a previously proposed velocity analysis method, we formulated a method for estimating the dipping parameters and correcting the effects of dipping structures. First, we derived an arrival time formula for the PP reflection of the dipping Moho, which includes the effects of the ray parameters, dipping structures, and azimuthal distribution of available events. Second, the formula was used for move out correction and velocity analysis. Finally, by scanning the peak of the Moho energy group in the velocity spectrum, which varies with the azimuth and dip angles, a method was proposed to estimate the dipping parameters of the Moho. We referred to the scanning map as a dipping spectrum. A field data test at station NE44 revealed the prospects of the practical applications of this method. The dip angle of the Moho below the station was 3 degrees, and exhibited an azimuth angle of 25 degrees NE. The stacked waveform of the Moho reflection was significantly enhanced. This method was successfully applied to more stations adjacent to station NE44. Our results provide new insight on the Moho in this area, which are important for imaging and interpretation in areas that contain a dipping Moho such as plate subduction zones.

SCI

英语

通讯

National Natural Science Foundation of China[41904105,42074056] ; China Postdoctoral Science Foundation[2019M662172] ; Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology[ZDSYS20190902093007855] ; Shenzhen Science and Technology Program[KQTD20170810111725321]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000788044100001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.China Univ Min & Technol, Sch Resources & Geosci, Xuzhou, Jiangsu, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Deep Offshore Oil & Gas Explorat, Shenzhen, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Zhou, Jinju,Hu, Nan,Hu, Yong,et al. Feasibility of Estimating Parameters and Enhancing Reflections of Dipping Moho From Teleseismic P Wave Coda Autocorrelation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(5).

Zhou, Jinju,Hu, Nan,Hu, Yong,&Zhang, Wei.(2022).Feasibility of Estimating Parameters and Enhancing Reflections of Dipping Moho From Teleseismic P Wave Coda Autocorrelation.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(5).

Zhou, Jinju,et al."Feasibility of Estimating Parameters and Enhancing Reflections of Dipping Moho From Teleseismic P Wave Coda Autocorrelation".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.5(2022).