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Nodal Seismometer Array Recordings of Aftershocks of the 6 February 2023 Mw 7.8 and Mw 7.6 Kahramanmaraş, Turkiye Earthquake Sequence

Description: 

Aftershocks of the 6 February 2023 Mw 7.8 and 7.6 Kahramanmaraş, Türkiye Earthquake Sequence extended more than 550 km along the NE-SW-trending East Anatolian fault (EAF) and about 200 km along the E-W-trending Sürgü –Çardak fault (SCF) to its intersection with the EAF. Events from this sequence were recorded by the Türkish National Seismic Network (TNSN TU), which operates 321 stations (AFAD, 1990), and the Türkish National Strong Motion Network (TNSMN – TK), which operates 826 stations (AFAD, 1973) in Türkiye. Stations of these large networks are dispersed throughout the country, and the spacing between stations is highly variable, particularly within the aftershock area of the 2023 Kahramanmaraş sequence. To better evaluate aftershocks, causative faults, regional ground motions, and regional seismic velocities using more uniformly spaced stations, the U.S. Geological (USGS) and the Türkish Ministry of Interior Disaster and Emergency Management Authority (AFAD) recorded aftershocks from July 2023 until December 2023 using nodal seismometers. The nodal seismometers were deployed as (1) a two-dimensional grid of 3-component seismometers (> 400 km in longest dimension) and (2) three linear 3-component arrays across known or suspected causative faults. The 2-D nodal seismometer stations were spaced at ~30-km intervals, and stations of the linear arrays were spaced at either 0.5 or 1 km. A total of 126 nodal seismometers were deployed, and although many of them were retrieved by early December 2023, some of the nodal seismometers were left in the field to continue recording until about January 2024. The combined networks (TU, TK, and Nodal) are expected to provide data for developing an event catalog of unprecedented detail for the region, from which subsurface fault locations and connectivity can be better evaluated, regional ground motions can be better modeled, and regional P- and S-wave velocity models can be developed.

Session: Illuminating Complex, Multiplet Earthquake Sequences at Kahramanmaras (Turkiye), Herat (Afghanistan), and Beyond [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Rufus

Student Presenter: No

Invited Presentation: 

Authors