NSF Org:	CMMI Division of Civil, Mechanical, and Manufacturing Innovation
Recipient:	REGENTS OF THE UNIVERSITY OF CALIFORNIA, THE
Initial Amendment Date:	September 2, 1999
Latest Amendment Date:	July 31, 2000
Award Number:	9908218
Award Instrument:	Standard Grant
Program Manager:	Clifford J. Astill CMMI  Division of Civil, Mechanical, and Manufacturing Innovation ENG  Directorate for Engineering
Start Date:	October 1, 1999
End Date:	September 30, 2002 (Estimated)
Total Intended Award Amount:	$230,331.00
Total Awarded Amount to Date:	$235,331.00
Funds Obligated to Date:	FY 1999 = $230,331.00 FY 2000 = $5,000.00
History of Investigator:	Steven Glaser (Principal Investigator) glaser@ce.berkeley.edu Lane Johnson (Co-Principal Investigator)
Recipient Sponsored Research Office:	University of California-Berkeley 1608 4TH ST STE 201 BERKELEY CA  US  94710-1749 (510)643-3891
Sponsor Congressional District:	12
Primary Place of Performance:	University of California-Berkeley 1608 4TH ST STE 201 BERKELEY CA  US  94710-1749
Primary Place of Performance Congressional District:	12
Unique Entity Identifier (UEI):	GS3YEVSS12N6
Parent UEI:
NSF Program(s):	GEOTECHNICAL I, GEOMECHANICS & GEOMATERIALS
Primary Program Source:	app-0100  app-0199
Program Reference Code(s):	1038, 1039, 1576, 9251, CVIS
Program Element Code(s):	144800, 163400
Award Agency Code:	4900
Fund Agency Code:	4900
Assistance Listing Number(s):	47.041

ABSTRACT

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9908218
Glaser
Engineers have always relied on rate- and state-dependent constitutive models
(behavioral criteria). Recent advances by the condensed-matter physics
community have resulted in hypothetical theoretical mechanisms responsible for
frictional resistance to sliding. These models explain behaviors from angstrom
scale to kilometers-long earthquake dislocations, and provide a theoretical
framework for understanding material creep as well as self-healing slip on the
San Andreas fault. Since there has been little direct experimental proof that
the posited fundamental physical mechanisms indeed are at work, the PIs will
leverage their experimental and interpretive ability to image these
micro-mechanisms. Given that the fundamental kinematics of frictional junctions
results in production of phonons (vibrational, hence acoustic, energy), the
combination of quantitative acoustic emission and waveform inversion is
uniquely able to image these kinematics. Glaser has developed surface and
embeddable sensors proven capable by NIST of measuring picometer displacements
from 10 kHz to 1 MHz to within 3 dB. Studies show that the dynamic record
transduced by these sensors match the theoretical kinematic waveforms
remarkably well, allowing whole-waveform inversion for source kinematics rather
than single-point moment tensor inversion.

The results of this project will further science and engineering on several
levels. Fundamental understanding of the physical mechanisms behind sliding
friction, leading to improvement of basic understanding of the physical world.
This will help refine current empirical understanding of friction and allow
great improvement in mechanical design from nanomachines to sub-kilometer-scale
structures. In addition, fundamental questions about kilometer-scale
earthquake source mechanisms will be answered, in particular the issues
surrounding the notion of self-healing slip, thereby leading to an improved
understanding of the earthquake dislocation mechanism, and ultimately improved
seismic safety.
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