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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Frictional stability of porous tuff breccia under subsurface pressure conditions and implications for shallow seismicity

Fig. 2

Porous tuff breccia sample used in the experiments. a Photomicrograph of the tuff breccia sample under plane-polarized light. b X-ray diffraction profile of the experimental sample. The X-ray diffraction analysis was done under the following conditions: a Cu anode, acceleration voltage of 40 kV, current of 20 mA, step size of 0.02°, and scan speed of 2°/min. Pl, plagioclase; Opx, orthopyroxene; Cpx, clinopyroxene; Sm, smectite; Hem, hematite

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