Seismic Swarm PS20120119.1: Analysis of Activity Southwest of Lata, Solomon Islands

The seismic swarm PS20120119.1 occurred 36 km southwest of Lata in the Solomon Islands. It began at 17:01 on 18 January 2012 and ended at 05:58 on 19 January 2012, lasting 12 hours and 57 minutes. Six earthquakes were recorded during this interval.

The sequence opened with two magnitude 5.3 events at depths of 17 km and 38 km. These were followed by a magnitude 5.1 earthquake at 39 km depth. Subsequent activity included a magnitude 5.1 event at 46 km, a magnitude 4.8 event at 34 km, and a final magnitude 5.7 earthquake at 12 km depth. Depths ranged from 12 km to 46 km, with most events clustered between 30 km and 46 km.

This swarm represents one of six documented since 1 January 2000. Earlier swarms took place in 2000, 2004, 2006, 2007, 2008, and 2009, indicating recurrent swarm behavior in the area over two decades.

The region has also hosted multiple strong earthquakes since 2000. Notable events include an M8.0 earthquake on 6 February 2013 located 51 km from the swarm center, an M7.1 event the same day 51 km from the center, two additional M7.0 and M7.1 shocks on 6 February 2013 at 53 km and 76 km distances, an M7.0 event on 18 July 2015 at 77 km, and an M7.2 earthquake on 2 September 2007 at 74 km. These larger shocks demonstrate elevated seismic potential near the swarm location.

The Solomon Islands lie within a tectonically active zone characterized by repeated seismic swarms and major earthquakes. Swarm patterns, such as the short-duration cluster in PS20120119.1, reflect localized stress release along plate boundaries. Historical recurrence since 2000 underscores the area's ongoing seismic productivity.

Data sourced from SeismoSight internal classification records.