Attributes of 2D GPR data to characterize eolian-fluvial interaction deposits

ZABALA MEDINA, P.; SALVÓ BERNÁRDEZ, S.C.; OSELLA, A.M.; BONOMO, N.; LIMARINO, O.

La Haya

Conferencia; Near Surface Geoscience Conference & Exhibition 2019; 2019

EAGE

GPR is one of the geophysical methods most used to explore and characterize the shallow surface, in particular, to study eolian and fluvial deposits in sandy environments. A usual prospecting strategy is to acquire longitudinal profiles and transects, with the goal of determining the geometry of the structures along and through a determined vertical plane, which is often parallel to the predominant wind direction of a given period. Normally, the data are acquired by using the reflection mode and the constant offset configuration, and then processed through standard procedures. With this methodology, detailed images of the reflectors in the soil can be obtained, from which the interpretation is performed. A complementary practice, which has been little used in the area of GPR, is to calculate attributes of the data. The main objectives of using attributes are to reveal and quantify different properties of the reflection patterns that improve its interpretation. In this work, we analyze different attributes of the GPR data sections, to investigate present eolian-fluvial interaction deposits. In particular, we show that attributes as the rms frequency, apparent dip, curvature and parallelism produce information that is useful to differentiate similar sedimentary units and characterize them in detail