Near-field strain observations of the October 2013 Ruisui, Taiwan, earthquake: source parameters and limits of very short-term strain detection

Earth, Planets and Space

Table 1 Observed and theoretical volumetric strain static offsets (in n ε)

Sites	HGSB	SSNB	CHMB	ZANB
Location (Lon-Lat)	121.4237°–23.4903°	121.3981°–23.4423°	121.4703°–23.4868°	121.4530°–23.4062°
Observed	−910	−380	−300	−12
Model (1)	1310	784	−1442	−683
Model (2)	−2214	−1367	−91	167
Model (3)	−909	−381	−298	−13

(1) Source parameters from GPS inversion (strike =200°, dip =45°, rake =42°), (2) source parameters from seismology (209°, 59°, 50°), (3) source model inferred from our best solution through a grid-search approach using co-seismic static strain offsets (217°, 48°, 49°). The slip is assumed to be 0.096 m on a 30 km × 30 km fault plane. The center of the fault plane is located at 15 km depth at the position (121.3694° E, 23.6033° N) for models (1) and (2) and at 15.5 km depth at the position (121.3785° E, 23.6725° N) for model (3), respectively. A positive sign denotes an extension. Location of the sites (Longitude-Latitude) is also described