Fluid Inversion codes

The codes used in Mukuhira et al., 2022</p

Seismic swarm catalog & fluid volume estimates data

The seismic swarm catalog was originated in Yoshida, K. & Hasegawa, A. Hypocenter migration and seismicity pattern change in the Yamagata-Fukushima border, NE Japan, caused by fluid movement and pore pressure variation. J. Geophys. Res. Solid Earth 123, 5000–5017 (2018). </p

Preparatory Process in Advance of Runaway Fault Rupture through Fluid Injection observed in Laboratory Experiments using a Large Specimen of Sub-meter scale

Fault slip is initiated by locally applied fluid pressure, and it can expand unstably over a wide area causing elastic waves having magnitudes that induce felt or destructive earthquakes. Thus, it is important to examine the unstable expansion of initial slips. However, it is hard to reproduce the process by general setup of laboratory experiment such as triaxial loading tests on cylindrical specimens with inclined faults. In this study, we prepared a cubic specimen of sub-meter scale, which was separated into two triangular prisms by a model fault. The specimen was subjected to bi-axial compressions with different magnitudes. A 2D array of strain gauges was embedded beneath the fault plane to measure the changes in shear strain with the fault slip driven by fluid injection. Based on the experimental results, we discussed the features of fault slips that lead to injection-induced earthquake. The dataset obtained by the experiments were presented in the current data repository

Catalog of locations of microseismic events accompanying the 2006-2007 fluid injection into the Basel Enhanced Geothermal System

Supplement data to Mukuhira et al. "Injection induced seismicity size distribution dependent on shear stress" published in Geophysical Research Letters (https://doi.org/10.1029/2020GL090934) This dataset contains the catalog of locations of microseismic events occurring in 2006-2007 that accompanied the fluid stimulation at the Basel Enhanced Geothermal System (EGS) site in Basel, Switzerland. The catalog includes event ID, occurrence date and time (trigger time), location, cluster ID and moment magnitude. The 1st row is a header line to explain data and units. The catalog was made using the multiplet analysis method by Asanuma et al., 2008 (Society of Exploration Geophysicists expanded abstract, 2008). For the detail, please see that paper, which is referenced below. Cluster ID 0 means non multiplet event (single event). The Catalog is the result of multiplet analysis performed using the 40-97 Hz frequency band of the waveforms. Hiroshi Asanuma, Yusuke Kumano, Hirokazu Moriya, Hiroaki Niitsuma, Ulrich Schanz, and Markus Häring, (2008), "Identification of microseismic multiplets in the frequency domain and interpretation of reservoir structure at Basel, Switzerland," SEG Technical Program Expanded Abstracts: 1451-1455.https://doi.org/10.1190/1.305918