Electronic Supplement to
Reconciling Precariously Balanced Rocks (PBRs) with Large Earthquakes on the San Andreas Fault System

by Lisa Grant Ludwig, James N. Brune, Abdolrasool Anooshehpoor, Mathew D. Purvance, Richard J. Brune, and Julian C. Lozos

Table S1 Measured Fragility Parameters from Tilt Tests and the Parameters Estimated from Photomodeling.

PBR	Photomodelling		Distances from Center of Mass		Tilt Tests
	α1 (rad)	α2 (rad)	R1 (m)	R2 (m)	α1	α2
GV02	-	-	-	-	0.2541	0.3816
GV03	0.2214	0.4346	0.3546	0.2968	0.1689	0.3125
GV05	-	-	-	-	0.25	0.4961
GV06	-	-	-	-	0.1814	-
SW01	0.2144	0.3755	0.5406	0.5054	-	-
SJ08	0.213	0.364	0.4703	0.4736	0.1294	0.3585

Parameters α₁ and α₂, (in radians) and distances R₁ and R₂ (in meters) are defined by Purvance et al. (2008) and are illustrated in Figure S8.

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