The Effect of Secondary Arrivals on Regional Earthquake Locations

Catalog Locations with Secondary Phases

Seismicity maps of the main study region for various catalogs are shown in black. Events having secondary phases are shown in yellow. Each of the three catalogs shown has a significant portion of events with secondary phases. However, most or all of these secondary phases are not defining (not used for determining location).

Earthquake Data Report (EDR, USGS) International Seismic Centre (ISC) Review Event Bulletin (REB)
International Data Centre (IDC)

Introduction | Catalog Locations with Secondary Phases | Ground Truth Constraints on Relocations Near a Large-Magnitude Event
Synthetic Tests Pt. 1 | Synthetic Tests Pt. 2 | Relocations of Actual Data | Relocations Using S Phases for the Asia Study Area | Summary