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Geoelectrical dimensionality analyses in volcanic region using magnetotelluric phase tensor
Nurhasana, Sutarno D.a, Prihantoro R.a, Ogawa Y.b, 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]Magnetotelluric (MT) is one of the geophysical methods which are used in mapping subsurface resistivity distribution of the earth by utilizing electromagnetic (EM) wave as an energy source. Through the measurement of electric and magnetic field in orthogonal direction above the surface of the earth, resistivity distribution of the subsurface can be mapped while the penetration depth depends on the frequency of the EM wave. In many cases, three-dimensional resistivity structures are often approximated by two-dimensional models without checking the dimensionality of the structure prior to perform modeling. However, such approximation can be misleading if the structure is purely 3D where electromagnetic fields can not be separated into TE and TM modes. To overcome this problem, a dimensionality analysis is important in order to get the general feature of the structure in particular in 3D structure as expected in volcanic area. There are many methods to analyze dimensionality of the resistivity structure such as Bahr’s method and Groom-Bailey decompositions, which assume that the regional structure is two-dimensional. Here, we examine the dimensionality analyses using the phase tensor and induction vector, which is no assumption of two-dimensional for regional structure. The parameter “beta” is also used as an index of three-dimensionality of the structure. The resistivity value and area of the synthetic model were made as close as possible to the real volcanic structure in order to confirm the ability of this method in volcanic region. We also applied this method to the real magnetotelluric data collected from volcanic zone. The result shows that the volcanic region is electrically dominated by 3D structure at shallow part where conductive zone with circle-like shape exists in the middle of the model. The pure 2D structure was found at the deep part of the model. © 2012 American Institute of Physics.[/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][/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]Induction vector,Magnetotelluric methods (MT),Phase tensor,volcanic resistivity structure[/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/10.1063/1.4730708[/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]