SEISMIC WAVES FROM HELGOLAND BLAST OF 18 APRIL 1947. PART II,

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Abstract:

This portion of the report discusses horizontal earth displacements caused by the Helgoland blast and includes the calibration curves for the seismograms presented in Part I. The displacements at the earths surface due to the longitudinal and transverse waves through the granitic layer decreased as the 1.23 and 2.52 powers of distance respectively. Earth displacements due to the longitudinal and transverse waves that traveled below the earths crust decreased as the 2.11 and 2.25 powers of distance respectively. The maximum amplitudes registered on the seismometers that recorded the longitudinal component of the earths motion decreased as the 2.80 power of distance the maximum amplitudes registered for transverse components of earth displacement decreased as the 2.41 power. Author

Author(s):
Pomerantz, J. ; Perkins, B., Jr. ; Atanasoff, J. V. ; Bonwit, K. S.
Author Organization(s):
NAVAL ORDNANCE LAB WHITE OAK MD
Pagination:
0012

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NOLR-1080-Pt-2
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
(*SEISMIC WAVES, EXPLOSION EFFECTS), HIGH EXPLOSIVE AMMUNITION, NORTH SEA, BLAST, EPICENTERS, EARTHQUAKES, WEST GERMANY, GRANITE, RANGE(DISTANCE), CALIBRATION
Field(s)/Group(s):
Explosions
Keyword(s):
EARTH CRUST, HELGOLAND, NORTH ATLANTIC OCEAN, PRIMARY WAVES, S WAVES, SEISMOGRAMS
Report Date:
1948 Nov 22