Naval Command, Control and Ocean Surveillance Center
RDT&E Division,
San Diego, CA 92152-5001
Cover Photo

NRaD Technical Report 1669

A Three-Dimensional Geoacoustic Model for the Catalina Basin

Version 1.0

R. T. Bachman

August 1994

Approved for Public Release; Distribution is Unlimited.


CONTENTS

GEOACOUSTIC MODELS

CATALINA BASIN

SEDIMENT GEOACOUSTIC PROPERTIES

FINE-GRAINED SEDIMENT

COARSE-GRAINED SEDIMENT

BASEMENT GEOACOUSTIC PROPERTIES

MIOCENE/PLIOCENE SEDIMENTARY ROCKS

IGNEOUS AND METAMORPHIC ROCKS

CONSTRUCTING A GEOACOUSTIC MODEL

REFERENCES

APPENDICES

A: GEOACOUSTIC MODELING DETAILS

B: GRIDDED DATABASE

C: SEDIMENT THICKNESS

D: WATER DEPTH

E: MEAN GRAIN SIZE

F: SEDIMENT AND ROCK SAMPLES

G: SEAWATER SOUND SPEED AND DENSITY

FIGURES

1. Catalina basin and environs

2. Seismic reflection profile

3. Geologic map of Catalina Basin

A-1. In situ and seismic measurements of sound speed

A-2 In situ measurements of sound speed and density compared with predictions

A-3. Compilation of sound attenuation versus frequency measurements

B-1. Organization of the gridded database

C-1. Sediment thickness in the Catalina Basin

D-1. Gridded National Ocean Service depth data

D-2. Gridded National Ocean Service depth data and interpolations

D-3. Bathymetry of Catalina Basin constructed from final gridded bathymetry

D-4. SeaBeam survey of Emery Knoll

D-5. Bathymetry of Emery Knoll based on gridded depths

E-1. Mean grain size contours in phi units

F-1. Sediment sample locations, Catalina Basin

F-2. Rock sample locations

G-1. Seasonal sound speed profiles

TABLES

1. Example geoacoustic model

B-1. Geographic database file format

F-1. Surface sediment samples

F-2. Rock samples

G-1. Winter seawater data

G-2 Spring seawater data

G-3. Summer seawater data

G-4. Autumn seawater data

Report Documentation Page