Electromagnetic emissions during rock blasting

Radio emissions during quarry blasting have been recorded in the audio frequency band. Three distinct mechanisms are suggested to explain the observed results; rock fracture at the time of the explosion, charged rocks discharging on impact with the pit floor and micro‐fracture of the remaining rock...

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Bibliographic Details
Published inGeophysical research letters Vol. 18; no. 5; pp. 889 - 892
Main Authors O'Keefe, S. G., Thiel, D. V.
Format Journal Article
LanguageEnglish
Published United States Blackwell Publishing Ltd 01.05.1991
Subjects
422000 - Engineering- Mining & Underground Engineering- (1980-)
580000 - Geosciences
Blasting (explosive)
EARTHQUAKES
ELECTROMAGNETIC RADIATION
ENGINEERING
Explosions
EXPLOSIVE FRACTURING
FRACTURE MECHANICS
FRACTURING
FRAGMENTATION
GEOSCIENCES
MECHANICS
MINING
MONITORING
PRESSURE EFFECTS
RADIATIONS
Radio emission
RESERVOIR PRESSURE
RESERVOIR ROCK
Rock
ROCK MECHANICS
SEISMIC EVENTS
SURFACE MINING
Trains
Walls
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Summary:Radio emissions during quarry blasting have been recorded in the audio frequency band. Three distinct mechanisms are suggested to explain the observed results; rock fracture at the time of the explosion, charged rocks discharging on impact with the pit floor and micro‐fracture of the remaining rock wall due to pressure adjustment of the bench behind the blast. The last mechanism was evident by a train of discrete impulses recorded for up to one minute after the blast. It is assumed that during this time the rock behind the blast was subjected to a significant change in pressure. This may be related to ELF observations during earthquakes.
Bibliography:ark:/67375/WNG-286ZSMC0-C
istex:EEAD6E9787CC5C756C54A782ABDCB01FDC3B4852
ArticleID:91GL01076
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0094-8276
1944-8007
DOI:10.1029/91GL01076