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subsurface structures at the Chang'e-3 Landing Site: Interpretations from Orbital and In-Situ Imagery Data

Journal of Earth Science 2016年第4期27卷 707-715页

作者： Le Qiao Zhiyong Xiao Jiannan Zhao Long Xiao Planetary Science Institute School of Earth Sciences China University of Geosciences

The Chang＇e-3（CE-3） spacecraft successfully landed on one of the youngest mare surfaces on the Moon in December 2013. The Yutu rover carried by CE-3 was equipped with a radar system that could reveal subsurface structures in unprecedented details, which would facilitate understanding regional and global evolutionary history of the Moon. Based on regional geology, cratering scaling, and morphological study, here we quantify the subsurface structures of the landing site using high-resolution orbital and in-situ imagery data. Three layers of lunar regolith, two layers of basalt units, and one layer of ejecta deposits are recognized at the subsurface of the landing site, and their thicknesses are deduced based on the imagery data. These results could serve as essential references for the on-going interpretation of the CE-3 radar data. The ability to validate our theoretical subsurface structure using CE-3 in-situ radar observations will improve the methods for quantifying lunar subsurface structure using crater morphologies and scaling.

关键词： Chang'e-3 subsurface structure impact cratering Lunar Penetrating Radar lunar ex-ploration.

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Identification of hidden faults using determining velocity structure profile by spatial autocorrelation method in the west of Mashhad plain(Northeast of Iran)

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Journal of Mountain Science 2021年第12期18卷 3261-3274页

作者： Seyedeh Fatemeh NEMATI Naser HAFEZI MOGHADAS Gholam Reza LASHKARIPOUR Hosein SADEGHI Department of Geology Faculty of ScienceFerdowsi University of MashhadMashhad 91775-1436Iran

Characterizing the subsurface structure is an important parameter for the improvement of seismic hazard *** to the tectonic complexity of the earth,some deep fractures do not reach the earth's surface and are not detectable with visual ***,the lack of knowledge of faults and fractures can result in disasters,especially in urban *** geophysical methods can be used to estimate subsurface structure ***,a more reliable method is required to assess seismic hazards and reduce potential damage in metropolitan areas without destroying buildings and *** paper aims to identify hidden faults and structures using shear wave velocity *** do this,surface wave dispersion curve was extracted from the vertical component of microtremor array recording using the spatial autocorrelation(SPAC)method in two profiles and 13 array stations(perpendicular to the altitudes)to obtain shear wave velocity structure(Vs)in the west of Mashhad,northeast of *** results of shear wave velocity profiles(Vs)indicate sudden changes in the thickness of *** can be related to the displacement of a normal fault in this area causing the bottom rock to fall and an increase in the alluvial thickness in the central part of the *** velocity in the floor rock is 2000 meters per second in this *** to the surface outcrops and water wells data,its material is slate and Phyllite metamorphic rocks that are exposed in the adjacent ***,the seismic profile results were well consistent with electrical resistance data and well logs indicating that the tool array method is flexible,non-invasive,relatively fast,and effective for urban areas with satisfactory accuracy.

关键词： subsurface structure Hidden Fault Array Microtremor SPAC Method Vs Profile Mashhad Seismic hazard assessment

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Depth and Structural Parameters Determination of the Sedimentary Basin in Atmur Nuqra Area, South Eastern Desert, Egypt Using Aeromagnetic Data Analysis

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Geomaterials 2021年第2期11卷 23-41页

作者： Ahmed A. Elhusseiny Asmaa A. Azzazy Nuclear Materials Authority Cairo Egypt

The study area is located at the south of the eastern desert of Egypt between latitudes 24°N to 25°N and longitudes 33°E to 33°50'E covering an area of about 9407 km2. The study area is mainly covered with sediments whose age extends from the upper Cretaceous to the Quaternary, in addition to the presence of some basement rocks such as younger granites, metasediments and metagabbro. The research aims essentially to determine the thickness of the sedimentary basin by determining the depth to the top of basement and delineating the subsurface geological structures which affected this sedimentary basin. The Euler depth map exhibited that the north parts of the area have shallow depth values from 1000 m to 2000 m. The southern parts also show a shallow to moderate depths ranging from 1000 m to 2400 m. The deepest parts are located at the middle and at the western parts and are ranging in value from 3000 m to more than 4000 m. The horizontal derivative and tilt derivative techniques proved that the most effective trends all over the study area are NW-SE and NE-SW directions as mentioned in geologic lineaments map. The basement tectonic map shows clearly all the faults affected the area. It shows that there are many high blocks trending mainly in NW-SE and NE-SW directions. All high blocks surround a large sedimentary basin reaches depth of about more than 4000 m. All the results produced from 2D-modeling illustrate that the sedimentary basinal area (G2) is the deeper basin all over the area and it is controlled by some faults and fractures. 3D inversion was used and resulted in that the area of study have many high blo

关键词： subsurface structure Depth to Basement Magnetic Interpretation Atmur Nuqra Area Eastern Desert

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