USArray Consists of Four Observatories

Array of Arrays: Elusive ETS in the Cascadia Subduction Zone

The Array Operations Center supported research by the UW team, staging out of Sequim, Washington in June 2009. Eight arrays, each consisting of 10 Texan (single channel) and 10 RT130 (triple channel) data recorders were deployed across the northern Olympic Peninsula in hopes of catching the next Episodic Tremor event. Read More

Batholiths Onland 2009

In July 2009, several IRIS/PASSCAL scientists assisted with the Batholiths Onland project. This large group effort involved over 50 scientists and grad students, for the purpose of making "a seismic refraction and wide-angle reflection survey across the Coast Mountains batholith of British Columbia, Canada." Read More

Bighorns Mountains of Wyoming: Formation of Basement-involved Foreland Arches

This three year (2009-12) collaborative project will integrate arch-scale upper crustal geometries from surface exposures and petroleum industry subsurface data with the results of a hybrid seismic experiment. The passive component of this experiment consists of a 1.25 year (2009-10) deployment of 27 broadband seismometers that densify the EarthScope transportable array, a 6.5 month deployment of 220 short period seismometers, and a 9 day deployment of 800 high frequency "Texan" seismometers. Read More

Message to IRIS Consortium Members and Friends

The biennial IRIS Workshops are an important opportunity for you to learn about your Consortium’s activities and provide your guidance and advice as we plan for the future. Read More

Seismometer Testing Facility Dedicated to Former IRIS PASSCAL Program Manager

Jim Fowler, the first Program Manager for IRIS PASSCAL, was honored during a naming ceremony dedicating a seismometer test vault to him. Read More

Stormy Times Ahead: Impact of Solar Coronal Mass Ejection on Geomagnetic Field Detected by USArray

Researchers making use of EarthScope’s USArray Magnetotelluric Observatory take advantage of high altitude electric currents caused by a large solar flare. Read More