... a major earthquake may have particular patterns at particular faults, and FOS _Earth Science_DC.indd 176 2/ 8/10 10:59:48 AM earth ScienceS 190(February 19, 20 02) : 2, 514 2, 521 . e researchers ... area. After nearly 20 years of experience at the San Andreas Fault near Parkfi eld, researchers decided to probe deeper. In the summer of 20 02, researchers drilled a 1. 4- mile (2. 2-km) vertical hole ... Sur-vey, and Southern California Earthquake Center.Shelly, David R., Gregory C. Beroza, Satoshi Ide. “Non-Volcanic Trem-or and Low-Frequency Earthquake Swarms.” Nature 446 (March 15, 20 07):...