Earthquake lightning is grounded in rock slides

Temblor ◽  
2021 ◽  
Author(s):  
Melissa Weber
Keyword(s):  
Rock Slides

Site investigation and modelling of earthquake-induced rock slides in central-southern Chile

2016 ◽  
pp. 1823-1828
Author(s):  
S Sepúlveda ◽  
C Pastén ◽  
S Moya ◽  
M García ◽  
M Lara ◽  
...  
Keyword(s):  
Site Investigation ◽  
Southern Chile ◽  
Rock Slides

Visible geological effects of the CANNIKIN event

1972 ◽  
Vol 62 (6) ◽  
pp. 1519-1526 ◽  
Author(s):  
R. H. Morris ◽  
L. M. Gard ◽  
R. P. Snyder
Keyword(s):  
Vertical Displacement ◽  
Ground Zero ◽  
Subsidence Area ◽  
Collapse Time ◽  
Field Investigations ◽  
Principal Directions ◽  
Two Stages ◽  
Steep Slopes ◽  
Rock Slides ◽  
Lake Beds

abstract Postshot field investigations indicate that most of the visible geological effects produced by the CANNIKIN event are limited to an area of a 2-km radius from ground zero (GZ). Two stages of fracturing are recognized, one at shot time that induced a maximum of 0.6 m vertical displacement along the Teal Creek Fault located 1,070 m northwest of GZ, and one inferred to have occurred at collapse time (38 hr later). The three principal directions of fractures are east-northeast, northwest, and north and are related to pre-existing faults and lineaments. Major displacement along a fault located 760 m southeast of GZ is inferred to have occurred during collapse. Preliminary surveys indicate that the collapse sink is asymmetric with relation to GZ. The oval subsidence area is 1,270 by 915 m and the surface low, located 366 m southeast of GZ, subsided about 20 m. Several lakes are forming in the sink area. A portion of the intertidal platform along the Bering coast was uplifted about 1 m and major rock slides occurred along the cliffs within this zone of uplift. Elsewhere, minor rockfalls, slides and tundra slumps occurred along cliffs or steep slopes. Lake beds have been fractured and, in some cases, the lakes have drained.

Rock Slides and Topples

2021 ◽  
Author(s):  
Doug Stead ◽  
Davide Donati ◽  
Marc-André Brideau
Keyword(s):  
Rock Slides

Magnitude and frequency of rock falls and rock slides along the main transportation corridors of southwestern British Columbia

1999 ◽  
Vol 36 (2) ◽  
pp. 224-238 ◽  
Author(s):  
O Hungr ◽  
S G Evans ◽  
J Hazzard
Keyword(s):  
British Columbia ◽  
Rock Slope ◽  
Sampling Procedure ◽  
Rock Fall ◽  
Rock Falls ◽  
Geological Conditions ◽  
Transportation Corridors ◽  
Risk Magnitude ◽  
Frequency Relationship ◽  
Rock Slides

The two main transportation corridors of southwestern British Columbia are subject to a range of rock slope movements (rock falls, rock slides, and rock avalanches) that pose significant risks to road and rail traffic travelling through the region. Volumes of these landslides range from less than 1 m3 to over 4.0 × 107 m3. A database of rock falls and slides was compiled for rail and highway routes in each transportation corridor using maintenance records spanning four decades. The records number approximately 3500, of which about one half includes information on volume. Magnitude - cumulative frequency (MCF) relationships were derived for each corridor. A scaled sampling procedure was used in part to reduce the effects of censoring. Both corridors yield MCF curves with significant linear segments on log-log plots at magnitudes greater than 1 m3. The form of both railway and road plots for each corridor shows similarity over several orders of magnitude. The slope of the linear segments of the curves depends on geological conditions in the corridors. Temporal histograms of the data show a trend towards reduction of rock fall frequency as a result of rock slope stabilization measures, implemented during the 1980s and 1990s. A risk analysis methodology using the slope of the magnitude-frequency relationship is outlined. The major part of the risk to life in the case examined results from rock falls in the intermediate-magnitude range (1-10 m3).Key words: rock fall, rock slide, landslide hazard, risk, magnitude-frequency, British Columbia.

Geotechnical characteristics of large rapid rock slides

2010 ◽  
Vol 47 (1) ◽  
pp. 116-132 ◽  
Author(s):  
James Glastonbury ◽  
Robin Fell
Keyword(s):  
High Strength ◽  
Significant Loss ◽  
Slide Mass ◽  
Geotechnical Characteristics ◽  
Lateral Margins ◽  
Internal Deformation ◽  
Strength Rock ◽  
First Time ◽  
Loss Of Strength ◽  
Rock Slides

Based on the analysis of 51 case studies of large rapid rock slides, for a landslide to travel rapidly after failure there has to be a significant loss of strength on the basal surface of rupture, lateral margins, and (or) internally within the slide mass, or the factor of safety has to be maintained below 1.0 after failure by high groundwater pressures. Internally sheared compound slides and translational slides may all travel rapidly depending on their detailed geotechnical and geometric characteristics. The characteristics of these landslides that suggest an increased likelihood of rapid failure have been identified. All the rapid rock slides examined in this study involved relatively high-strength rock masses. Most cases were considered to be first-time landslides, largely involving brittleness on the basal rupture surface. However, there were some cases considered to be reactivated or active landslides on pre-sheared rupture surfaces. For this latter group, the loss of strength leading to rapid landsliding was associated with brittle internal deformation or lateral margins.

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