Site investigation with combined methods in a faulted area in Managua, Nicaragua - a pre-study

Författare

Rainer Parrales
Torleif Dahlin
Carlos A. Rubí

Redaktör

Stanislav Mareš

Summary, in English

Geophysical methods are increasingly being applied to geotechnical investigations, as they can identify material properties and material boundaries, as well as variations in space and time of relatively large volumes of soil. Another advantage is that many of these methods are non-intrusive. The combination of several methods and the verification of their results by sampling and correlating with geotechnical methods are advisable in order to improve the reliability of geophysical investigations. In this case we used the following geophysical methods; combined resistivity and time domain induced polarisation (IP) two-dimensional imaging (CVES), seismic refraction plus multi-channel analysis of surface waves (MASW).

The geophysical results are compared to a geologically documented trench, which had been dug 5m south of the geophysical line with a N65°W orientation. The trench intercepted an active fault zone. The geological study determined that the intercepted fault zone corresponds to the Escuela Fault System, one of a many of the complex faulting system within the so-called Managua Graben.

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