Front. Earth Sci. Frontiers in Earth Science Front. Earth Sci. 2296-6463 Frontiers Media S.A. 770719 10.3389/feart.2021.770719 Earth Science Correction Corrigendum: Precise Monitoring of Pore Pressure at Boreholes Around Nankai Trough Toward Early Detecting Crustal Deformation Ariyoshi et al. Corrigendum: Precise Monitoring of Pore Pressure Ariyoshi Keisuke 1 * Kimura Toshinori 1 Miyazawa Yasumasa 1 Varlamov Sergey 1 Iinuma Takeshi 1 Nagano Akira 1 Gomberg Joan 2 3 Araki Eiichiro 1 Miyama Toru 1 Sueki Kentaro 1 Yada Shuichiro 1 Hori Takane 1 Takahashi Narumi 4 Kodaira Shuichi 1 Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan United States Geological Survey, Seattle, WA, United States University of Washington, Seattle, WA, United States National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan

Edited and reviewed by: Sergey V. Samsonov, Department of Natural Resources, Canada

 *Correspondence: Keisuke Ariyoshi, ariyoshi@jamstec.go.jp

This article was submitted to Solid Earth Geophysics, a section of the journal Frontiers in Earth Science

 30 09 2021 2021 9 770719 04 09 2021 16 09 2021 Copyright © 2021 Ariyoshi, Kimura, Miyazawa, Varlamov, Iinuma, Nagano, Gomberg, Araki, Miyama, Sueki, Yada, Hori, Takahashi and Kodaira. 2021 Ariyoshi, Kimura, Miyazawa, Varlamov, Iinuma, Nagano, Gomberg, Araki, Miyama, Sueki, Yada, Hori, Takahashi and Kodaira

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A corrigendum on Precise Monitoring of Pore Pressure at Boreholes Around Nankai Trough Toward Early Detecting Crustal Deformationby Ariyoshi K., Kimura T., Miyazawa Y., Varlamov S., Iinuma T., Nagano A., Gomberg J., Araki E., Miyama T., Sueki K., Yada S., Hori T., Takahashi N. and Kodaira S. (2021) Precise Monitoring of Pore Pressure at Boreholes Around Nankai Trough Toward Early Detecting Crustal Deformation. Front. Earth Sci. 9:717696. doi: 10.3389/feart.2021.717696 slow slip event slow earthquake kuroshio meander nankai trough ocean modeling

In the original article, there were mistakes in Figure 1B and Figure 13. In these figures, there were wrong focal mechanisms of VLFE, which contradicted with those in Figure 1A. The corrected Figure 1B and Figure 13 appear below.

(A) Map of the fault model (A-1, A-2+) of the SSE and sVLFE in March 2020 from previous results (Ariyoshi et al., 2021). Squares represent borehole stations. Labeled names (D-16, D-13, and C-11) are the nearby DONET stations for C0002 (blue), C0010 (red), and C0006 (yellow), respectively. Focal mechanism is obtained from Ariyoshi et al. (2021). (B) Seismic section showing the location of the boreholes C0002 (937–980 mbsf), C0010 (610 mbsf), and C0006 (453.5 mbsf), where mbsf = meter below seafloor; VE = vertical exaggeration. The average source location errors of sVLFEs are 5 and 2 km for horizontal and vertical component, respectively (Nakano et al., 2018). Spatial resolution of focal depth and fixed dip angle for the SSE is 1 km and 6°, respectively (Ariyoshi et al., 2021). The focal depths of the fault models A-1 and A-2+ are assumed to be consistent with VLFE because it is practically difficult to determine the focal depth precisely from only the two volumetric strain data at boreholes (C0002 and C0010) by using the simplified green’s function. (C) Borehole completion diagram at C0006. The solid magenta ellipses indicate the pressure gauges, where the top one (Pc0) is a hydrostatic reference pressure sensor used to remove oceanographic signals, BRT = below rotary table, and MSL = mean sea level. Figures (B,C) are modified after Figure 1 of Araki et al. (2017) and Figure 2 of Kinoshita et al. (2018), respectively.

Schematic scenario of the possible process for the SSE with ocean loading (A) during model A-1, (B) during model A-2+, and (C) termination of the SSE. Representative focal mechanism of VLFE is obtained from Ariyoshi et al. (2021). Double arrows represent volumetric strain change due to crustal deformation driven by the SSE.

As an additional explanation for Figure 1B, “the focal depths of the fault models A-1 and A-2+ are assumed to be consistent with VLFE because it is practically difficult to determine the focal depth precisely from only the two volumetric strain data at boreholes (C0002 and C0010) by using the simplified green’s function.”

The authors apologize for these errors and state that they do not change the scientific conclusions of the article in any way. The original article has been updated.

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