CENTRAL THEME:

WE CAN TELL HOW THE ENERGYWAS RELEASED FROM ANY

SOURCE BY LOOKING AT THEPATTERN OF WAVES RECORDED AT

DIFFERENT SEISMIC STATIONSAROUND THE WORLD:

FAULT PLANE SOLUTIONSCENTROID MOMENT TENSORS

(CMT’S)

ENERGY RELEASES ON/IN THE EARTHTHREE GENERAL TYPES

1. ISOTROPIC (I)-METEORITE IMPACTS-CHEMICAL EXPLOSIONS-NUCLEAR EXPLOSIONS-PHASE CHANGES

2. DOUBLE COUPLE (DC)-EARTHQUAKES

3. COMPENSATED LINEAR VECTORDIPOLE (CLVD)-MAGMA INJECTION

TYPES OF WAVES RADIATED FROM DCSOURCES

1. BODY WAVES- P WAVES- S WAVES

2. SURFACE WAVES- LOVE WAVES- RAYLEIGH WAVES

WE WILL ONLY CONSIDER PWAVE RADIATION PATTERNS:

BEACH BALLS

P WAVES ARE LONGITUDINALMECHANICAL WAVES: THEYEITHER SQUEEZE (PUSH) ORSTRETCH (PULL) THE EARTH

ENERGY RELEASES ON/IN THE EARTHTHREE GENERAL TYPES

1. ISOTROPIC (I)-METEORITE IMPACTS-CHEMICAL EXPLOSIONS-NUCLEAR EXPLOSIONS-PHASE CHANGES

2. DOUBLE COUPLE (DC)-EARTHQUAKES

3. COMPENSATED LINEAR VECTORDIPOLE (CLVD)-MAGMA INJECTION

P & S WAVES RADIATE OUT INA QUADRANTIAL PATTERN

FROM THE FOCUS OF ANEARTHQUAKE

WE THEN PLOT THEDISTRIBUTION OF

COMPRESSIONS ANDDILATATIONS ON A

STEREONET