Robert W. Simpson

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The 1989 Loma Prieta, California, earthquake perturbed the static stress field over a large area of central California. The pattern of stress changes on major faults in the region predicted by models of the earthquake's dislocation agrees closely with changes in the regional seismicity rate after the earthquake. The agreement is best for models with low(More)
In a randomised cross-over study 18 nondependent (NIDDM) and 9 insulin-dependent (IDDM) diabetics were put on to a high carbohydrate diet containing leguminous fibre (HL) for 6 weeks, and also a standard low carbohydrate diet (LC) for 6 weeks. During two identical 24 h metabolic profiles mean preprandial and mean 2 hour postprandial blood glucoses were(More)
A physically-motivated model for earthquake recurrence based on the Brownian relaxation oscillator is introduced. The renewal process defining this point process model can be described by the steady rise of a state variable from the ground state to failure threshold as modulated by Brownian motion. Failure times in this model follow the Brownian passage(More)
The magnitude 7.3 Landers earthquake of 28 June 1992 triggered a remarkably sudden and widespread increase in earthquake activity across much of the western United States. The triggered earthquakes, which occurred at distances up to 1250 kilometers (17 source dimensions) from the Landers mainshock, were confined to areas of persistent seismicity and(More)
Obtaining high-quality measurements close to a large earthquake is not easy: one has to be in the right place at the right time with the right instruments. Such a convergence happened, for the first time, when the 28 September 2004 Parkfield, California, earthquake occurred on the San Andreas fault in the middle of a dense network of instruments designed to(More)
The DNA fraction from a line of bovine embryonic kidney cells originally exposed as primary cultures several months earlier to a temperature-sensitive (ts) mutant of respiratory syncytial (RS) virus could be used to transfect human HEp-2 cells with the production of infectious RS virus. The DNA donor cells, designated BEK/RS ts, retained their healthy(More)
Thirteen poorly controlled noninsulin-dependent diabetic subjects ingested in succession over 5.5 wk their usual low-carbohydrate, low-fiber diet (LCF) for 3 d, a high-carbohydrate, high-fiber diet (HCF) for 3 wk, and the LCF diet again for 2 wk. All diets were designed to be individually isoenergetic. Fasting plasma glucose fell significantly during the(More)
Seventeen non-insulin-dependent diabetic patients were randomly allocated to their usual diet supplemented daily with either 28 g sucrose or 30 g starch (isoenergetic with sucrose) and saccharin (equivalent sweetness). After 6 weeks, the supplements were reversed. No significant treatment effects were observed on fasting concentrations of blood glucose,(More)
We present a new three-dimensional inventory of the southern San Francisco Bay area faults and use it to calculate stress applied principally by the 1989 M = 7.1 Loma Prieta earthquake and to compare fault seismicity rates before and after 1989. The major high-angle right-lateral faults exhibit a different response to the stress change than do minor oblique(More)