Revealing Tectonic Structure by Utilizing the Boundary Analysis Methods on Aeromagnetic Data of Bitlis Zagros Suture Zone and Its Surroundings, Turkey

Year 2017, Volume: 2 Issue: 1, 37 - 48, 25.02.2017

Fikret Dogru

Abstract

Boundary
analysis techniques which are analytic signal, total horizontal derivative
(THDR), theta map, tilt angle, hyperbolic of tilt angle (HTA), normalized total
horizontal gradient (TDX) and normalized horizontal derivative (NTHD), play an important
role in interpreting potential field data. In this study, an enhanced total horizontal
derivative of the tilt angle (ETHDR) method was utilized for comparison of results
with the other edge detection filters. The sufficiency of the ETHDR method is
indicated using theoretical models and field study. Compared with the formal
methods, the ETHDR filter more detailed outcomes for buried models and is less
sensitive to noise. Aeromagnetic anomaly of Bitlis Zagros Suture Zone (BZSZ)
and its surroundings was used for field data. The eastern
part of Turkey which has major tectonic structures such as East Anatolian Fault
(EAF), Malatya Fault (MF) and Bitlis-Zagros Suture Zone (BZSZ), with the effect
of Arabian Plate’s northward motion, Anatolian block and Northeastern Anatolian
Block escape to west and east, respectively. In the first stage field
study, the discontinuities were not found recognizable in the results of
boundary analysis methods. Then, pole reduction and upward continuation (5 km
and 10 km) were applied to the aeromagnetic data for revealing the deeper
effects on data. The same boundary analysis methods were applied to
aeromagnetic data after pole reduction and upward continuation. The results
were compared with each other and the anomalies were associated with the faults
and previous studies. It is thought that there are tectonic boundaries that have
not yet been identified geologically in the study area.

Keywords

Edge detection, pole reduction, upward continuation, tilt angle, Bitlis-Zagros Suture Zone

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