Determination of predominant site period of loose terestrial units (Caliche) by microtremor measurements

Year 2018, Volume: 156 Issue: 156, 205 - 220, 27.06.2018

Kıvanç Zorlu

https://doi.org/10.19111/bulletinofmre.348301

Abstract

The caliche profi les
that have been observed in arid-semi arid climate regions can be described as
terrestrial formations which are vertical succession and composed predominantly
of calcium carbonate. At the top of the caliche profi le, there is hard pan
leyer as a weak rock and soft pan layer characterized by loose soil is existed.
Caliche is formed by the displacement and/or cementation of soil, rock, and
weathered material, and is usually found in unsaturated zones. In the study
area, consist of caliche units located in Adana. It is noteworthy that the
caliches of Quaternary is widely crop out throughout the region, exhibited a fl
at topography in the region locate at this unit. The paleosolic deposits in the
Adana Basin, which is characterized by climate oscillations in the Pleistocene
and surface waters rich in carbonate, following draining, capillarity and
weathering, initially formed as a result of sedimentological and followed by
pedological processes. Adana is located in the I. and II. degree seismic zone,
where many earthquakes have been observed in historical and instrumental
periods. It was found that the greatest structural damage sustained by the
earthquakes that occurred in Adana especially in 1998, was seen in the
buildings located on caliche ; it is believed that the damage caused to the
buildings located on chalice can be attributed to the of morphologically
distinct layers or horizons. This study determines the sediment amplifi cation
characteristics and horizontal to vertical spectral ratio (H/V) within the
borders. Accordingly, to demonstrate H/V between the hard pan and the soft pan
horizon of the caliche, 24 microtremor measurements were performed on locatio
ns with soft pan, on locations with no hard pan, and on locations where the profi
le directly begins with the soft pan.

Keywords

Adana, microtremor, earthquake, caliche, Nakamura method

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