The objectives of the Seismology group are to support the SCEC mission to gather data on
earthquakes in Southern California, and use the seismic networks as research tools to integrate
the data into physics-based models that improve our understanding of earthquake phenomena.
Proposals to enhance the seismic networks as research tools and foster innovations in network
deployments, data collection, and data processing are encouraged, especially where they include
collaboration with network operators in Southern California and provide community products
that support one or more of the numbered goals in A, B, C or D.
Important SCEC resources are the Southern California Earthquake Data Center (SCEDC) whose
continued operation is essential to deciphering Southern California earthquakes as well as crustal
and fault structure, the network of SCEC funded borehole instruments to record high quality
reference ground motions, and the pool of portable instruments that is operated in support of
targeted deployments or aftershock response.
Examples of research strategies that support the objectives above include:
- Enhancement and continued operation of the SCEDC and other existing SCEC facilities. In
particular, the near real-time availability of earthquake data from SCEDC and enhanced
automated access are important for ongoing SCEC research activities. In support of
tomographic, state of stress, earthquake predictability, and other seismicity studies, enhance the
availability and usefulness of data products, such as waveforms, catalogs of earthquake
parameters, arrival time and polarity information, and signal-to-noise measures as well as
moment tensors and first motion mechanisms (A6, A7).
- Enhancements in the real-time processing of network data to improve the estimation of
source parameters in relation to known and unknown faults (A3, A4, A10). Other activities could
be testing of the performance of new early-warning algorithms, the determination of high
precision real-time earthquake locations, or developing finite source algorithms for use in the
real-time processing environment (D).
- Experiments that investigate the near-fault crustal properties as well as develop constraints
on crustal structure and state of stress are also the goals of other SCEC groups (A7, A10, C).
Develop innovative and practical strategies for densification of seismic instrumentation,
including borehole instrumentation, along major fault zones in Southern California to measure
fault zone properties and capture near-field motions for constraining kinematic and dynamic
simulations of earthquakes (B1, B2, B3, B4, B5). Collaborations, for instance with the ANSS
and NEES projects, that would augment existing and planned network stations with downhole
and surface instrumentation to assess site response, nonlinear effects, and the ground coupling of
built structures (B4, B6) are encouraged. Collaborations with EarthScope and other network
operators to develop innovative new methods to search for unusual signals using combined
seismic, GPS, and borehole strainmeter data (A5, A6) are also encouraged. Other possible
strategies (often started with SCEC seed funds) include the design of future passive and active
experiments such as dense array measurements of basin structure and large earthquake
properties, OBS deployments, and deep basement borehole studies.