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Geoelectrical dimensionality analyses in Sumatran Fault (Aceh segment) using magnetotelluric phase tensor
Prihantoro R.a, Nurhasana, Sutarno D.a, Ogawa Y.b, Priahadena H.a, Fitriani D.c
a Physics Department, Bandung Institute of Technology, Indonesia
b Volcanic Fluid Research Center, Tokyo Institute of Technology, Japan
c Physics Department, Padjadjaran University, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Earth electrical / geoelectrical conductivity may vary in any direction in a complex earth model. When conductivity only varying within one direction such as depth, it is considered as an one-dimensional (1-D) structure model. Two-dimensional (2-D) and three-dimensional (3-D) structure have more degrees of conductivity variation. In magnetotelluric (MT) surveys localized heterogeneities in conductivity near the Earth’s surface distort the electromagnetic (EM) response produced by the underlying or ‘regional’ conductivity structure under investigation. Several attempts had been done to remove this distortion effect in measured MT transfer functions (impedances tensor) by a series of techniques and general conductivity models of increasing complexity. The most common technique are Bahr’s method and Groom-Bailey decompositions, that is restricted by assumption of two dimensional (2D) regional conductivity structure. MT phase tensor technique proposed by Caldwell et al. (2004) requires no assumption about the dimensionality of the regional conductivity structure and is applicable where both the heterogeneity and the regional conductivity structure are 3-D. Here, we examine the dimensionality analyses using the MT phase tensor to measured data of Sumatran Fault (SF) Aceh segment that we’ve collected during July 2012. A small value of phase tensor dimensionality indicator (β) was found along the profile. This result indicate a strong a two dimensionality of regional conductivity structure of SF Aceh segment. © 2014 AIP Publishing LLC.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]and Sumatran Fault Aceh segment,Conductivity structures,Conductivity variation,Dimensionality analysis,Impedance tensor,One-dimensional (1-D) structure,Three dimensional (3D) structures,Two Dimensional (2 D)[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]and Sumatran Fault Aceh segment,Conductivity structure,impedance tensor,magnetotellurics,phase tensor[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1063/1.4868767[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]