S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Themes by Tom Henyey.

SOUTHERN CALIFORNIA EARTHQUAKE CENTER

Themes

by

Tom Henyey


“Shared Minds”

by

Michael Schrage


Multidisciplinary Interaction = Collaboration

Collaboration is one of the most productive and important

of all human relationships.


Real Science

- the science that matters, the science that changes our

views of reality -

is an elaborate and inherently collaborative process.


In collaboration you try to get a communal mind going; you want to

get people’s minds to interact as components of a larger mind.You get a communal brain.

What matters are not just the individual talents. But the ability to

integrate them.Collaboration is the process of

shared creation.


Creatinga shared understanding

is simply a different task than exchanging information.


Collaboration is not the sum of individual actions;

rather collaboration must be greater than the

sum of the individual parts.


SCEC'S Master Theme

The whole (Center) is greater than the sum of the individual

parts (Investigators).


If we now return to Schrage's thesis that collaboration must be greater

than the sum of the individual parts, then:

Center = Collaboration

And thus one measure of our success as a center is to look for

evidence of collaboration.


Evidence for Collaboration:(Collaboration Themes)

– Common Goal –Master Model


Evidence for Collaboration:

– Interactive Opportunities –Opportunities for Communication

• Working groups

• Workshops

• Symposia

• Field campaigns

• Annual meeting



– Integration –

• Phase I, II, and III reports• Earthquake ground motion scenarios• Los Angeles basin velocity model• Southern California Integrated GPS network• Workshops and symposia


Integration of GPS into Risk Estimation


Fence Diagram from the SCEC Seismic Velocity Model of Southern California


Top panel: A “sonogram” type image originally for oil exploration made by recording signals from a vibrator moving along a north-south line. The vibrations reflect off buried structures which can be seen in the data when all seismograms are looked at together. Knowing the structures beneath southern California allows for better understanding of where earthquakes can occur, and how the ground will shake as a result. These data were used to construct the upper diagram showing that this was the causal fault for the 1987 earthquake.

Bottom panel: Diagram of sub-surface structure in southeast Los Angeles County. The relationship between the Whittier Narrows blind fault that warps the overlying strata, and the 1987 Whittier Narrows earthquake is shown.



– Shared Facilities –

• Data Centers (CIT, UCSB, UCSD)

• Santa Barbara Instrument Center

• SCIGN

• Post-Doctoral Fellows program

• Summer Undergraduate Intern program


GPS Velocity Map of Southern California



– System-level Science –

• Seismic hazard models

• Fault system behavior (e.g., faults of Los Angeles)


Top panel: Surface projections of major fault systems of the Los Angeles area. Edges with triangles represent the “tops” of the fault planes – solid if the fault breaks the surface and hollow if the fault is buried. The opposite edge of each fault system mapped above represents the “bottom” of the fault plane which is generally 10-15 km deep. Black areas are the surfaces which moved during earthquakes (including the black line on the near-vertical San Andreas fault). The magnitude listed is for a hypothetical earthquake which breaks the entire fault system.

Bottom panel: 51 potential moderate (M6.5-M6.8) earthquakes on the major fault systems. Numbers denote the recurrence intervals for earthquakes in each section.



– Problem Identificationand

Consensus Building –• Phase I, II, and III reports

• Focus on the Los Angeles basin

• SCIGN

• LARSE I and II


SCEC Phase III Report

An investigation of how and if site effects can be accounted for in probabilistic seismic hazard analysis (PSHA) in southern California

Conclusions:1) Detailed classification (beyond rock versus soil) is justified

with the Wills et al. (2000) map.

2) Basin depth is a significant factor, even for PGA (but may be a proxy).

3) Uncertainty (sigma) remains high after site corrections.



– Pooled Manpower and Resources –

• LARSE I and II

• Post-earthquake responses

• SCIGN


Los Angeles Regional Seismic Experiment

Top panel:

Crustal structure image across the Los Angeles basin and San Gabriel Mountains from seismic transect.

Bottom panel: Interpretation of fault structure based on data from top panel.



– Post-earthquakeResponse –

• Landers

• Northridge

• Hector Mine

• Turkey



– Interdisciplinary Education and Training –

• Summer Undergraduate Intern program• Post-doctoral Fellows and Graduate student

programs at core institutions• LARSE I and II• Annual meetings and poster sessions• Workshops



– Partnerships, and Links to Other Earthquake Information

Providers & Research Entities –• With USGS• With JPL/NASA• With CDMG• With PEER/CUREe• With many through SCEC's Education and

Knowledge Transfer program


Collaboration between Earth Scientists and Engineers


Other Important Center Attributes

• Sustained scientific efforts

• Seeded occasional "risky" projects

• Addressed the same natural laboratory

• Open data policy

• Knowledge transfer activities

• Broadened graduate education


Collaboration Themes Summary• Common goal• Interactive & communication opportunities • Integration• Shared facilities• System-level science• Problem identification & consensus building• Pooled manpower and resources• Post-earthquake response• Interdisciplinary education & training• Partnerships and links


I maintain that the evidence of successful collaboration is

overwhelming.

Thus, according to the premise that:

Center = Collaboration

we must declare that SCEC is, in fact, greater than the sum of its parts, and

a success!

S OUTHERN C ALIFORNIA E ARTHQUAKE C ENTER Themes by Tom Henyey.

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