Figure 1
From: Multiscale off-fault brecciation records coseismic energy budget of principal fault zone
Representative field occurrences of breccia-1 in Ichinokawa. (a) Geological map of the Shikoku. (b) Geological maps and distribution of MTL segments around Saijo. (c) District geology of Ichinokawa areas where the apparent relationship between the MTL and Ichinokawa breccia in terms of distances are observed. (d) Crackle breccia with minimum clast-rotation; breccia-1 (bx-1). (e) Aerial photograph and schematic illustration showing the relationship between bx-1 and breccia-2 (bx-2), where the pervasive bx-2 intrudes the mega clast of bx-1 with the respective mineral vein (qtz) parallel to schistosity and microfracture filled with dolomite. (f) Hand specimen of low-grade Sanbagawa pelitic schist and (g) its typical mineral assemblages that become a clast component of Ichinokawa breccia. (h) Mode I microfracture in pelitic schist. The fracture filled by dolomite and a lower quantity of quartz observed under backscatter detector image, which indicates the earliest generation of the matrix after the formation of bx-1.
