2007 Alum


An Overview

Plate kinematics and mechanisms: A perspective on the 20 April 2006 M7.6 Koryakia, Russia earthquake

Academic Affiliation: Junior, Humboldt State University, Mathematics and Physics
Science Research Mentors: Harley Benz - USGS; Antonio Villaseñor - Institute of Earth Sciences Jaume Almera; Steve Angster - USGS
Writing and Communication Mentor: Fran Boler - UNAVCO
Community Mentor: Susan Eriksson - UNAVCO
Peer Mentor: Lennox E. Thompson


Abstract

The occurrence of a Koryakia, Russia magnitude 7.6 earthquake during April 2006 was a mysterious and unusual event. Although the study area is geographically located near two major plates boundaries, the main event and those that followed may support evidence for existence of a microplate. This earthquake and its aftershocks were analyzed using historical seismicity, magnitude, depth, latitude, longitude, and focal mechanisms to determine seismic trends and kinematics. Harvard Centroid Moment Tensors (CMT) and P-axes were produced from the data collected during the events. Building upon existing knowledge of the local plate mechanisms, moment tensor data were analyzed and deformation patterns noted. The results showed trends in significant event epicenters and deformation patterns were used to identify two possible faults that were previously unknown. Data analysis from the events related to the 20 April 2006 shock is intended to add to the body of seismic knowledge for eastern Russia and provide a basis for future research that attempts to clarify microplate plate boundaries and Koryakia's kinematics.