Accession Number:

ADA516244

Title:

On the CTBT Monitoring Potential of Using LG-Phase Arrival Times at Local and Regional Distance Ranges

Descriptive Note:

Conference paper

Corporate Author:

GEOPHYSICAL INST OF ISRAEL HOLON (ISRAEL)

Personal Author(s):

• Pinsky, Vladimir I.
• Husebye, Eystein S.
• Matveeva, Tatiana S.
• Fedorenko, Yury V.

Report Date:

2008-09-01

Pagination or Media Count:

11.0

Abstract:

The prominent Lg wave is nearly always observed at local and regional distances. It is a surface wave propagating with almost constant group velocity around 3.5 kms over a vast distance range of hundreds to thousands of kilometers. Thus, Lg propagation should in principle simplify epicenter location schemes, based on relative travel time equations. In our ongoing efforts to accomplish this we computed Hilbert or STA-envelopes and showed that in many recordings from Fennoscandia and Central Europe the Lg group velocities measured using the envelope peak arrival times are remarkably consistent. However, they tightly concentrate around 3.4 kmsec for the Baltic shield of Fennoscandia and around 3.2 kmsec for the much younger crust of Central Europe. These Lg picks were subsequently used in the Pinsky 2008 relative time location algorithms of group beamforming and probabilistic beamforming for refined epicenter locations in Balticum.

Descriptors:

• *MONITORING
• *ARRIVAL
• *RANGE(DISTANCE)
• *PHASE
• SYMPOSIA
• SURFACE WAVES
• PROBABILITY
• TIME
• GROUP VELOCITY
• BEAM FORMING
• GROUND BASED
• EQUATIONS
• EPICENTERS
• HILBERT SPACE
• PROPAGATION
• NUCLEAR EXPLOSIONS
• BALTIC SEA
• ALGORITHMS
• ISRAEL

Subject Categories:

• Test Facilities, Equipment and Methods
• Target Direction, Range and Position Finding

Distribution Statement:

APPROVED FOR PUBLIC RELEASE