IRIS is a consortium of over 120 US universities dedicated to the operation of science facilities for the acquisition, management, and distribution of seismological data.
IRIS is a 501 (c) (3) nonprofit organization incorporated in the state of Delaware with its primary headquarters office located in Washington, DC. IRIS is governed according to By-laws.
IRIS provides seismic equipment and access to seismic and other data sets for researchers worldwide.
Inner core sensitive modes exhibit a spread of singlet frequencies far exceeding that which can be explained by plausible isotropic heterogeneity. This large deviation from sphericity contributes to non-uniqueness of the non-linear inversion for individual mode splitting functions. To alleviate this non-uniqueness, we have implimented a direct and simultaneous inversion of spectra from 25 modes for inner core structure.
The International Association of Seismology and Physics of the Earth’s Interior (IASPEI). It is one of the eight Associations that comprise the International Union of Geodesy and Geophysics (IUGG).
IASPEI promotes the study of earthquakes and other seismic sources, the propagation of seismic waves, and the Earth's internal structure, properties, and processes. Scientists participating in IASPEI initiate and co-ordinate research and scientific exchanges that demand co-operation among countries. Work on specific topics is carried out through commissions, committees, task and working groups formed to meet specific needs of new, exciting problems as they emerge.