DOI: 10.5061/dryad.9km1t86
title: Data from: Geologic and geomorphic controls on rockfall hazard: how well do past rockfalls predict future distributions?

description: To evaluate the geospatial hazard relationships between recent
 (contemporary) rockfalls and their prehistoric predecessors, we compare
 the locations, physical characteristics, and lithologies of rockfall
 boulders deposited during the 2010-2011 Canterbury earthquake sequence
 (CES) (n=185) with those deposited prior to the CES (n=1093). Population
 ratios of pre-CES to CES boulders at two study sites vary spatially from
 ~5:1 to 8.5:1. This is interpreted to reflect (i) variations in CES
 rockfall flux due to intra- and inter-event spatial differences in ground
 motions (e.g. directionality) and associated variations in source cliff
 responses, (ii) possible variations in the triggering mechanism(s),
 frequency, flux, record duration, boulder size distributions, and
 post-depositional mobilization of pre-CES rockfalls relative to CES
 rockfalls, and (iii) geological variations in the source cliffs of CES and
 pre-CES rockfalls. On interfluves, CES boulders traveled approximately 100
 to 250 m further downslope than prehistoric (pre-CES) boulders,
 interpreted to reflect reduced resistance to CES rockfall transport due to
 preceding anthropogenic hillslope de-vegetation. Volcanic breccia boulders
 are more dimensionally equant, rounded, larger, and traveled further
 downslope than coherent lava boulders, illustrating clear geological
 control on rockfall hazard. In valley bottoms, the furthest-traveled
 pre-CES boulders are situated further downslope than CES boulders due to
 (i) remobilization of pre-CES boulders by post-depositional processes such
 as debris flows, and (ii) reduction of CES boulder velocities and travel
 distances by collisional impacts with pre-CES boulders. A considered
 earth-systems approach is required when using preserved distributions of
 rockfall deposits to predict the severity and extents of future rockfall
 events.
description: Table S1_Rapaki_Pre-CES
 Rockfalls (RP)Data for Rapaki Pre-CES
 Rockfalls. Includes ID, Latitude, Longitude, Elevation, Volume, Lithology
 type.Table S2_Rapaki_CES
 Rockfalls (RP)Data for Rapaki CES
 Rockfalls. Includes ID, Latitude, Longitude, Elevation, Volume, Lithology
 typeTable S3-Purau_Pre-CES
 Rockfalls (RP)Data for Purau Pre-CES
 Rockfalls. Includes ID, Latitude, Longitude, Elevation, Volume, Lithology
 type.Table S4_Purau_CES
 Rockfalls (RP)Data for Purau CES
 Rockfalls. Includes ID, Latitude, Longitude, Elevation, Volume, Lithology
 type.Table
 S5_Rapaki_Pre-CES_Runout DataRunout Data for Rapaki
 Pre-CES Rockfalls. Includes ID, Latitude, Longitude, Elevation, Volume,
 Lithology type, MLR (map length runout), GLR (ground length runout), and
 Shadow Angle Data.Table
 S6_Rapaki_CES_Runout DataRunout Data for Rapaki
 CES Rockfalls. Includes ID, Latitude, Longitude, Elevation, Volume,
 Lithology type, MLR (map length runout), GLR (ground length runout), and
 Shadow Angle Data.Table
 S7_Purau_Pre-CES_Domain Runout DataPre-CES Runout Data for
 Purau Domains 1-4. Includes ID, Latitude, Longitude, Elevation, Volume,
 Lithology type, MLR (map length runout), GLR (ground length runout), and
 Shadow Angle Data.Table
 S8_Purau_CES_Domain Runout DataCES Runout Data for
 Purau Domains 1-4. Includes ID, Latitude, Longitude, Elevation, Volume,
 Lithology type, MLR (map length runout), GLR (ground length runout), and
 Shadow Angle Data.