scholarly journals Constraints on Rift Basin Structure and Border Fault Growth in the Northern Malawi Rift From 3-D Seismic Refraction Imaging

2018 ◽  
Vol 123 (11) ◽  
pp. 10,003-10,025 ◽  
Author(s):  
N. J. Accardo ◽  
D. J. Shillington ◽  
J. B. Gaherty ◽  
C. A. Scholz ◽  
A. A. Nyblade ◽  
...  
Keyword(s):  
Seismic Refraction ◽  
Rift Basin ◽  
Basin Structure ◽  
Border Fault ◽  
Fault Growth

Influence of normal fault growth and linkage on the evolution of a rift basin: A case from the Gaoyou depression of the Subei Basin, eastern China

AAPG Bulletin ◽  
2017 ◽  
Vol 101 (02) ◽  
pp. 265-288 ◽  
Author(s):  
Yin Liu ◽  
Qinghua Chen ◽  
Xi Wang ◽  
Kai Hu ◽  
Shaolei Cao ◽  
...  
Keyword(s):  
Eastern China ◽  
Normal Fault ◽  
Rift Basin ◽  
Fault Growth

Normal fault growth and fault-related folding in a salt-influenced rift basin: South Viking Graben, offshore Norway

2010 ◽  
Vol 32 (4) ◽  
pp. 490-506 ◽  
Author(s):  
Karla E. Kane ◽  
Christopher A.-L. Jackson ◽  
Eirik Larsen
Keyword(s):  
Normal Fault ◽  
Rift Basin ◽  
Fault Growth

RIFT-BASIN STRUCTURE AND ITS INFLUENCE ON SEDIMENTARY SYSTEMS

2002 ◽  
pp. 57-81 ◽  
Author(s):  
MARTHA OLIVER WITHJACK ◽  
ROY W. SCHLISCHE ◽  
PAUL E. OLSEN
Keyword(s):  
Rift Basin ◽  
Basin Structure

Integration of Multi-geophysical Approaches to Identify Potential Pathways of Heavy Metals Contamination - A Case Study in Zeida, Morocco

2020 ◽  
Vol 25 (3) ◽  
pp. 415-423
Author(s):  
Ahmed Lachhab ◽  
El Mehdi Benyassine ◽  
Mohamed Rouai ◽  
Abdelilah Dekayir ◽  
Jean C. Parisot ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Seismic Velocity ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Low Frequency ◽  
Electrical Current ◽  
P Wave ◽  
Low Resistivity ◽  
Refraction Tomography ◽  
Geophysical Surveys

The tailings of Zeida's abandoned mine are found near the city of Midelt, in the middle of the high Moulouya watershed between the Middle and the High Atlas of Morocco. The tailings occupy an area of about 100 ha and are stored either in large mining pit lakes with clay-marl substratum or directly on a heavily fractured granite bedrock. The high contents of lead and arsenic in these tailings have transformed them into sources of pollution that disperse by wind, runoff, and seepage to the aquifer through faults and fractures. In this work, the main goal is to identify the pathways of contaminated water with heavy metals and arsenic to the local aquifers, water ponds, and Moulouya River. For this reason, geophysical surveys including electrical resistivity tomography (ERT), seismic refraction tomography (SRT) and very low-frequency electromagnetic (VLF-EM) methods were carried out over the tailings, and directly on the substratum outside the tailings. The result obtained from combining these methods has shown that pollutants were funneled through fractures, faults, and subsurface paleochannels and contaminated the hydrological system connecting groundwater, ponds, and the river. The ERT profiles have successfully shown the location of fractures, some of which extend throughout the upper formation to depths reaching the granite. The ERT was not successful in identifying fractures directly beneath the tailings due to their low resistivity which inhibits electrical current from propagating deeper. The seismic refraction surveys have provided valuable details on the local geology, and clearly identified the thickness of the tailings and explicitly marked the boundary between the Triassic formation and the granite. It also aided in the identification of paleochannels. The tailings materials were easily identified by both their low resistivity and low P-wave velocity values. Also, both resistivity and seismic velocity values rapidly increased beneath the tailings due to the compaction of the material and lack of moisture and have proven to be effective in identifying the upper limit of the granite. Faults were found to lie along the bottom of paleochannels, which suggest that the locations of these channels were caused by these same faults. The VLF-EM surveys have shown tilt angle anomalies over fractured areas which were also evinced by low resistivity area in ERT profiles. Finally, this study showed that the three geophysical methods were complementary and in good agreement in revealing the pathways of contamination from the tailings to the local aquifer, nearby ponds and Moulouya River.

Compilation of seismic-refraction crustal data in the Soviet Union

1964 ◽  
Author(s):  
Robert Rodriguez ◽  
William P. Durbin ◽  
J.H. Healy ◽  
David H. Warren
Keyword(s):  
Soviet Union ◽  
Seismic Refraction ◽  
The Soviet Union

Seismic refraction surveys in the vicinity of Eagle City, Clark County, Ohio

1966 ◽  
Author(s):  
Jerry H. Hassemer ◽  
Joel S. Watkins ◽  
Norman G. Bailey
Keyword(s):  
Seismic Refraction ◽  
Clark County
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