Three-dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data

被引:84
作者
Aizawa, Koki [1 ,2 ]
Koyama, Takao [1 ]
Hase, Hideaki [1 ,3 ]
Uyeshima, Makoto [1 ]
Kanda, Wataru [3 ]
Utsugi, Mitsuru [4 ]
Yoshimura, Ryokei [5 ]
Yamaya, Yusuke [1 ,6 ]
Hashimoto, Takeshi [7 ]
Yamazaki, Ken'ichi [8 ]
Komatsu, Shintaro [8 ]
Watanabe, Atsushi [1 ]
Miyakawa, Koji [1 ]
Ogawa, Yasuo [3 ]
机构
[1] Univ Tokyo, Earthquake Res Inst, 7-3-1 Hongo, Tokyo 113, Japan
[2] Kyushu Univ, Inst Seismol & Volcanol, Fac Sci, Shimabara, Japan
[3] Tokyo Inst Technol, Volcan Fluid Res Ctr, Tokyo 152, Japan
[4] Kyoto Univ, Grad Sch Sci, Inst Geothermal Sci, Aso Volcanol Lab, Kumamoto, Japan
[5] Kyoto Univ, Disaster Prevent Res Inst, Uji, Kyoto, Japan
[6] Natl Inst Adv Ind Sci & Technol, Geol Survey Japan, Tsukuba, Ibaraki, Japan
[7] Hokkaido Univ, Fac Sci, Inst Seismol & Volcanol, Sapporo, Hokkaido 060, Japan
[8] Kyoto Univ, Miyazaki Observ, Disaster Prevent Res Inst, Miyazaki, Japan
关键词
magnetotellurics; 3-D inversion; 3-D resistivity structure; anomalous phase; SHINMOE-DAKE ERUPTION; LAS-CANADA CALDERA; ELECTRICAL-CONDUCTIVITY; PHASES; MODEL; CONSTRAINTS; 90-DEGREES; INVERSION; TENERIFE; BENEATH;
D O I
10.1002/2013JB010682
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Broadband magnetotelluric (MT) measurements were conducted in 2010 and 2011 in the vicinity of Shinmoe-dake Volcano in the Kirishima volcano group, Japan, where sub-Plinian eruptions took place 3 times during 26-27 January 2011. By combining the new observations with previous MT data, it is found that an anomalous phase in excess of 90 degrees is commonly observed in the northern sector of the Kirishima volcano group. Because the anomalous phase is not explained by 1-D or 2-D structure with isotropic resistivity media, 3-D inversions were performed. By applying small errors to the anomalous phase, we successfully estimated a 3-D resistivity structure that explains not only the normal data but also the anomalous phase data. The final model shows a vertical conductor that is located between a deep-seated conductive body (at a depth greater than 10 km) and a shallow conductive layer. By applying the findings of geophysical and petrological studies of the 2011 sub-Plinian eruptions, we infer that the subvertical conductor represents a zone of hydrothermal aqueous fluids at temperatures over 400 degrees C, in which a magma pathway (interconnected melt) is partially and occasionally formed before magmatic eruptions. To the north of the deep conductor, earthquake swarms occurred from 1968 to 1969, suggesting that these earthquakes were caused by volcanic fluids.
引用
收藏
页码:198 / 215
页数:18
相关论文
共 60 条
[41]   A resistivity cross-section of Usu volcano, Hokkaido, Japan, by audiomagnetotelluric soundings [J].
Ogawa, Y ;
Matsushima, N ;
Oshima, H ;
Takakura, S ;
Utsugi, M ;
Hirano, K ;
Igarashi, M ;
Doi, T .
EARTH PLANETS AND SPACE, 1998, 50 (04) :339-346
[42]   THE INFLUENCE OF CONTINENTS AND OCEANS ON GEOMAGNETIC VARIATIONS [J].
PARKINSON, WD .
GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY, 1962, 6 (04) :441-449
[43]   Finite-difference modelling of magnetotelluric fields in two-dimensional anisotropic media [J].
Pek, J ;
Verner, T .
GEOPHYSICAL JOURNAL INTERNATIONAL, 1997, 128 (03) :505-521
[44]   Magnetotelluric study of the Las Canadas caldera (Tenerife, Canary Islands):: structural and hydrogeological implications [J].
Pous, J ;
Heise, W ;
Schnegg, PA ;
Muñoz, G ;
Martí, J ;
Soriano, C .
EARTH AND PLANETARY SCIENCE LETTERS, 2002, 204 (1-2) :249-263
[45]   A MODEL FOR THE MOTION OF THE PHILIPPINE SEA PLATE CONSISTENT WITH NUVEL-1 AND GEOLOGICAL DATA [J].
SENO, T ;
STEIN, S ;
GRIPP, AE .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1993, 98 (B10) :17941-17948
[46]   Flank instability structure of Mt. Etna inferred by a magnetotelluric survey [J].
Siniscalchi, Agata ;
Tripaldi, Simona ;
Neri, Marco ;
Balasco, Marianna ;
Romano, Gerardo ;
Ruch, Joel ;
Schiavone, Domenico .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2012, 117
[47]   Three-dimensional magnetotelluric inversion: data-space method [J].
Siripunvaraporn, W ;
Egbert, G ;
Lenbury, Y ;
Uyeshima, M .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 2005, 150 (1-3) :3-14
[48]   An efficient data-subspace inversion method for 2-D magnetotelluric data [J].
Siripunvaraporn, W ;
Egbert, G .
GEOPHYSICS, 2000, 65 (03) :791-803
[49]   WSINV3DMT: Vertical magnetic field transfer function inversion and parallel implementation [J].
Siripunvaraporn, Weerachai ;
Egbert, Gary .
PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 2009, 173 (3-4) :317-329
[50]   Syneruptive deep magma transfer and shallow magma remobilization during the 2011 eruption of Shinmoe-dake, Japan-Constraints from melt inclusions and phase equilibria experiments [J].
Suzuki, Yuki ;
Yasuda, Atsushi ;
Hokanishi, Natsumi ;
Kaneko, Takayuki ;
Nakada, Setsuya ;
Fujii, Toshitsugu .
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, 2013, 257 :184-204