Signatures of localization control transition between rupture styles on basaltic megathrusts

Megathrust faults at subduction zones slip at a broad spectrum of rates from slow creep (centimeters per year) to dynamic rupture (meters per second), with large excess fluid pressures implicated as a control on nucleation style. We report friction measurements on oceanic basalt gouges (IODP Expedition 368X) at elevated temperatures (150-450 °C), stresses (150 MPa), and large fluid overpressures (30-120 MPa) to represent conditions along the descending slab and to link observed rheology to microtextural evolution. With reducing effective stress, slip instabilities are first manifested as slow-slip and evolve through dynamic stick-slip as a result of reduced shear zone width. This transition in rupture style is driven by an increase in effective fault stiffness k'c and a decrease in nucleation length L. Increased intergranular pressure dissolution at elevated effective stress mediates the shear localization w..., , # Data from: Signatures of localization control transition between rupture styles on basaltic megathrusts

Dataset DOI: [10.5061/dryad.dbrv15fft](https://doi.org/10.5061/dryad.dbrv15fft)

## Description of the data and file structure

**Rui Huang, Mengke An, Luanxiao Zhao, Derek Elsworth, Chris Marone, Jianhang Lv, Shutian Cao, Qiong Wang, Hehua Zhu, Quan Gan, Fengshou Zhang. Signatures of localization control transition between rupture styles on basaltic megathrusts.** ***Communications Earth & Environment***.

**Data S1**

**The friction-displacement data for all shear experiments on basalt gouges.**

 

**Authors**

Rui Huang

State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China

Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, The Pennsylvania State University, University Park, PA 16802...,