What Controls the Strength of Faults?

Position Description: In this project, we will investigate the strength of different clay minerals and how they impact deformation, faulting, and earthquake hazards. Clay minerals are common constituents of both ancient and active fault zones. Deformation experiments have shown that clays are frictionally weak compared to faults dominated by minerals like quartz and calcite. Aseismic creep along faults in the upper crust, such as the creeping portion of the San Andreas fault, is often attributed to the low frictional strength of clays. However, the strength of faults will vary depending on clay mineralogy. Here, we will use published rock deformation experiment data to determine which clays are weakest, and how clay properties change under varying pressure and temperature conditions. The student(s) will be given literature on rock deformation experiments and will be responsible for compiling a dataset on deformation conditions and frictional strength properties of different clay minerals. We will use these findings to draw conclusions about earthquake hazards and the behavior of faults in California. On-campus students will have an opportunity to use frictional sliding laboratory equipment.

Project Dates: June 5-June 23, 2023

Number of Available Positions: 2-3

Location: In-person or remote

Pay Rate: $700 stipend at completion of program

Qualifications/Requirements:

• No prior knowledge of the topic is necessary

• Computer and internet connection required

The Department of Earth and Planetary Sciences (EPS) welcomes everyone and aims for a diverse and inclusive community.  Preference will be given to freshman and sophomore students, but we encourage all interested students to apply. Students who are already working with members of the EPS community and non-Harvard students are not eligible for this position.