They are going to make Parkfield go sooner or later. I really cannot see USGS or others continuing dollars poured into the ancient prediction.

From the LA Times in 1998 came this:
"Regardless of when the quake occurs, [John Langbein] and Richard Andrews, director of the state Office of Emergency Services, said last week that some procedures worked out in the Parkfield experiment have become established in the state. These include mechanisms for alerting the public on shorter-term quake probabilities, when smaller earthquakes occur as possible foreshocks to larger ones.

Despite the failure of the quake to happen during the period expected, scientists remain interested in the sparsely populated Parkfield area, roughly midway between Los Angeles and San Francisco, because it was the scene of 6 magnitude quakes at fairly regular intervals over a 109-year period between the mid-19th and mid-20th centuries.

There were such jolts in 1857, 1881, 1901, 1922, 1934 and 1966. Based on the average 22-year interval, many scientists felt very confident that a similar quake would occur in the area within four years, either way, of 1988, and that was the genesis of the Parkfield prediction experiment."