What is the term for aseismic fault slip that occurs following a significant earthquake?

The term "afterslip" refers to the aseismic fault slip that occurs after a significant earthquake. This phenomenon happens when the fault continues to move slowly and gradually in the aftermath of the main seismic event, even though it is not accompanied by noticeable earthquakes. Aftershocks can occur shortly after the main event, but afterslip represents a different process where the fault adjusts over time due to the stresses that remain in the crust.

Typically, afterslip can result in additional displacement along the fault, and it serves as a mechanism for the fault to relieve any residual stress that was not fully released during the initial earthquake. This ongoing movement is important for understanding the long-term behavior of the fault system and can also inform hazard assessments in the affected areas.