... is the Hengill volcanic center, which lies on the plate boundary between the North American and the European crustal plates in southwestern Iceland. The rifting of the two plates has opened a north‐northeast‐trending system of normal faults with frequent magma intrusions. The Hengill central volcano and its...

...L. Hagos; H. Shomali; B. Lund; R. Böðvarsson; R. Roberts Abstract Using spectral amplitudes from the South Iceland Lowland ( SIL ) seismic network, we conduct a relative moment tensor inversion ( RMTI ) on aftershocks of the June 1998 M w 5.4 event that occurred at the Hengill triple junction...

... or thermal contraction due to cooling. Nevertheless, the possible biasing effects of wave propagation in structurally complicated volcanic regions has made the identification of non-DC mechanisms as true source phenomena uncertain. Non-DC earthquakes are common at the Hengill-Grensdalur volcanic complex...

... on time scales of thousands of years. Lake Thingvallavatn is oriented SW-NE, parallel to the trend of normal faults and fissures, which extend northeast from Hengill, a central volcano system. Thingvallavatn's lake sediments provide a continuous high-fidelity record of tectono-magmatic processes. Chirp...

... the evaluation of seismic hazard in the vicinity of geothermal power plants is associated with high uncertainty. Various ground‐motion datasets of induced and natural seismicity (from Basel, Geysers, Hengill, Roswinkel, Soultz, and Voerendaal) were compiled and processed, and moment magnitudes for all events...

...Figure 13. Location of the EM sites and boreholes in the Hengill geothermal area. Circles mark MT sites, dots indicate TDEM sites, triangles mark boreholes; H means Mt Hengill, He-Hellisheidi, Ne-Nesjavellir, Hv-Hveragerdi. Upper map is redrawn from Foulger and Toomey, (1989) , lower map...

... with that of the Hengill-Grensdalur area in Iceland, a largely unexploited water-dominated field in an extensional stress regime. These differences are poorly understood but may be linked to the contrasting regional stress regimes and the industrial exploitation at The Geysers. GeoRef, Copyright 2005, American...

... on inequality constraint for an amplitude ratio takes the same mathematical form as a polarity observation. Three-component digital data for an earthquake at the Hengill-Grensdalur geothermal area in southwestern Iceland illustrate the power of the method. Polarities of P , SH , and SV waves, unusually well...