Mapping the Fracture System of a Landslide by Pressure Probe Method

Szalai, Sándor and Szokoli, Kitti and Tóth, Ádám and Metwaly, Mohamed (2014) Mapping the Fracture System of a Landslide by Pressure Probe Method. In: 76th EAGE Conference & Exhibition 2014.

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Rock realignment in the subsurface may have an effe ct to the near surface-, or even to the surface sediments. The eventually produced mechanic ally weak zones may not however be directly seen from the surface. A new method, the s o-called pressure probe (Pre-P) method was developed for such problems to detect and chara cterise such areas. In this paper the features and application of this method is presente d on the example of a landslide. Repeatability of the Pre-P measurements, adequate s ampling distance, resolution of the method and the possible data processing steps are a lso investigated. The fracture system of the investigated landslide area could have been inv estigated by large resolution applying the Pre-P method. We know from these investigations tha t: 1. there are consolidated zones on the slope side of the fractures whose broadness correla tes with the broadness of the given fracture; 2. both the large and the small fractures follow each other periodically; 3. even the structure inside the blocks which belong to the lar ge fractures can be well seen which refers to the very good resolution of the method. It was m oreover shown that on the not-yet sliding side: 1. there are already fractures, that is the f uture slide-faces already exist; 2. those fractures are at least as wide as the fractures on the sliding side; 3. the blocks in this side are about two times wider than those of the sliding sid e. It is possible to pre-indicate, as well, that: 1. a several meter wide block will slump down before the main slide will happen; 2. the likelihood of sliding is much greater in the North part of the area than in the South part of it. The here presented Pre-P method seems to be the mos t favourable tool to map the fracture system of such kind of landslides according to its resolution capacity (even 2-3 cm wide fracture proved to be detectable by this method), s peed, simplicity of its application, the interpretation of the data and its costs. Moreover almost no field circumstances can limit its field application. The profiles and maps about the fracture system which can be constructed using the Pre-P method offer the possibility to bet ter understand landslides and to delineate the not yet endangered areas before other methods c ould do it.

Item Type: Conference or Workshop Item (Lecture)
Subjects: Q Science / természettudomány > QE Geology / földtudományok > QE01 Geophysics / geofizika
Depositing User: Henriett Szabó
Date Deposited: 22 Jan 2015 13:16
Last Modified: 22 Jan 2015 14:27

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