21. The black triangles indicate the Late Eocene Hatillo Thrust fault . 22. Most are so-called blind thrust faults that lie hidden in the earth at steep angles. 23. The 1994 Northridge quake, linked to a blind thrust fault near Los Angeles, registered 6.7. 24. Until now, most scientists believed blind thrust faults produced quakes of only up to 6.75-magnitude. 25. The destructive 1994 quake in Northridge, California was caused by a previously-undiscovered blind thrust fault . 26. No large historic earthquakes are known to have occurred on the Mount Diablo Thrust Fault . 27. This effect is particularly clear in the case of detachment faults and major thrust faults . 28. The Mount Diablo thrust fault runs through Alamo releasing small tremors about every other month. 29. We think the major hazard threatening Los Angeles right now are these blind thrust faults , 30. It is a thrust fault , meaning the sides of the fault push toward each other.
