Shaker by Scott Frank Knopf/Penguin/Random House, $26.95, 333 pages, ISBN 978-0-385-35003-7 The folks living over on the left coast, earthquakes are an accepted fact of life; about as ordinary—and as welcome—as public rudeness or graffiti on our national monuments. Quakes are grudgingly acknowledged as an unpleasant fact of life out there. A trade-off perhaps, for the warm, wonderful Mediterranean climate and endless eye-popping coastline, its scenic wonders and bountiful