H. Handoyo, J. Alcalde, D. Martí, J.J. Martínez-Díaz, T. Teixidó, R. Carbonell
The fault structure of Alhama de Murcia Fault (AMF) is has been characterized using the analysis of surface waves that identified in shallow high-resolution seismic reflection data. Multichannel analysis of surface waves (MASW) is applied to visualize the 2D Vs wave velocity model and image the geometry of the fault system in the segments of the fault located in the La Salud area. Two approaches have been used to achieve a well-constrained velocity model in the AMF fault zone. Standard seismic reflection processing workflow has been used to clear the seismic data and increase its S/N ratio. The Occam’s inversion has been used to invert the digitized surface wave dispersion curves. 1D shear wave velocity-depth profiles were estimated in shot and CDP domains. The result of this study is a 2D velocity-depth cross-section relatively well resolved were obtained by a composite of the 1D velocity-depth functions. These inversion 2D-velocity models can constrain the depth geometry of the fault zone up to 100 m depth penetration. The fault zone is indicated by a relatively low-velocity anomaly by decreasing shear modulus that correlates with the fault’s surface expression. © 2019 EAGE.
Institute of Earth Sciences Jaume Almera (ICTJA – CSIC), Department of Earth’s Structure and Dynamics, C/Lluís Solé i Sabarís s/n, 08028, Spain; Teknik Geofisika, Institut Teknologi Sumatera, Jalan Terusan Ryacudu Kecamatan Jati Agung, 35365, Indonesia; Lithica SCCL, Santa Coloma de Farners, 17430, Spain; Universidad Complutense de Madrid, Avda. de Séneca, 2 Ciudad Universitaria, 28040, Spain; Universidad de Granada, Calle La Paz 18, 52005, Spain