2010 Annual Meeting: Source Inversion Validation Workshop

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2010 SCEC Annual Meeting: Source Inversion Validation (SIV) Workshop

Organizers: P. Martin Mai, Morgan Page, Danijel Schorlemmer
Dates: Saturday, September 11, 2010 (1:30-5:30pm), Sunday September 12, 2010 (8:00am-12:00pm)
Location: Horizon Ballroom II, Hilton Palm Springs Resort, Palm Springs, CA
Participants: view list of registrants (Day 1 and Day 2)

Earthquake source inversions image the spatio-temporal rupture evolution on one or more fault planes using seismic and/or geodetic data. Source inversion methods thus represent important research tools in seismology to unravel the complexity of the earthquake rupture process. Researchers are using source-inversion results to study earthquake mechanics, to develop spontaneous dynamic rupture models, to build models for generating rupture realizations for ground-motion simulations, and to perform Coulomb-stress modeling. In all these applications, the underlying finite-source rupture models are treated as "data" (input information), but the uncertainties in these data (i.e. source models obtained from solving an inherently ill-posed inverse problem) are hardly known, and almost always neglected. The Source Inversion Validation (SIV) project is born out of recent efforts to better understand the intra-event variability of earthquake rupture models, as documented in the finite-source rupture model database.

During this workshop will review our recent activities and results regarding Green's function testing and a forward-modeling exercise for a finite-fault kinematic rupture. Additionally, we will examine initial inversion results for a first test problem, discussing also optimal seismic-network geometries for finite-fault studies.

We invite presentations that discuss SIV modeling/testing results, but also general contributions on source-inversion methodologies, analysis of resolution and model errors, and source-model variability in general. New approaches to source inversion and error characterization are also welcome. Presentations that highlight robust features of sources inversions or discriminate between artifacts and true heterogeneities are particularly encouraged.

Agenda:

Saturday, September 11, 2010 (1:30-5:30pm) *Session I: Review of SIV Activities and Green's Function Test Results*
1:30-1:45	Mai, Page, Schorlemmer: SIV Introduction
1:45-2:05	Causse, Mai, and all participants (given by Page): Results from Green's function test
2:05-2:35	Shao & Ji: What did the Exercise of SPICE Source Inversion Validation BlindTest I Not Tell You?
2:35-3:45	Discussion of Green's function results
3:45-4:00	break
*Session II: Inversion Techniques & Slip Models*
4:00-4:20	Song: Does earthquake slip follow Gaussian statistics?
4:20-4:50	Lavallee, Archuleta, Schmedes: Spectral analysis of slip spatial distributions
4:50-5:30	Discussion of previous talks & plans for Sunday breakout groups
Sunday, September 12, 2010 (8:00am-12:00pm) *Session III: Inversion Techniques and Seismic-Network Geometry*
8:00-8:30	Ellsworth: Source inversion with minimal assumptions
8:30-8:50	Minson: A Bayesian approach to finite-fault inversion
8:50-9:20	Meng & Ampuero: Optimal network geometries for source inversion
9:20-9:45	Discussion of previous talks, proposed setup for initial inversion test
9:45-10:00	break
*Session IV: Break-Out Session and Open Discussion*
10:00-10:45	Breakout groups meet Preliminary breakout groups: Input/Output formats, station geometry, source models, forward model calculations, misfit functions, web tools & development Where are we heading? What needs to be done? Who does what?
10:45-12:00	Summaries from breakout groups, Open Discussion

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