Figure 6

depth = 30 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

depth = 30 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

60˚W

60˚E

120˚

E

AFR

AUS

NA

Z

PAC

SAM

SCO

EANTWANT

EnLQML

AmH

NeS

MBL

rIS

RIS

ElL

AnP

AGV

GSMTransantarctic Mountains

EAM

OR

WARS

Ross S.

Weddell S.

Kergue

len P.

Lambert G.

A

C

F

Bal

Bou

STP

Mar

4.0 4.5S-velocity (km/s)

a)depth = 100 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

depth = 100 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

60˚W

60˚E

120˚

E

AFR

AUS

NA

Z

PAC

SAM

SCO

EANTWANT

EnLQML

AmH

NeS

MBL

rIS

RIS

ElL

AnP

AGV

GSMTransantarctic Mountains

EAM

OR

WARS

Ross S.

Weddell S.

Kergue

len P.

Lambert G.

A

C

F

Bal

Bou

STP

Mar

3.8 4.0 4.2 4.4 4.6S-velocity (km/s)

b)

depth = 150 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

depth = 150 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

60˚W

60˚E

120˚

E

AFR

AUS

NA

Z

PAC

SAM

SCO

EANTWANT

EnLQML

AmH

NeS

MBL

rIS

RIS

ElL

AnP

AGV

GSMTransantarctic Mountains

EAM

OR

WARS

Ross S.

Weddell S.

Kergue

len P.

Lambert G.

A

C

F

Bal

Bou

STP

Mar

4.0 4.2 4.4S-velocity (km/s)

c)depth = 200 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

depth = 200 km

180˚

150˚W

120˚W

90˚W

60˚W

30˚W

0˚

30˚E

60˚E

90˚E

120˚

E

150˚E

60˚W

60˚E

120˚

E

AFR

AUS

NA

Z

PAC

SAM

SCO

EANTWANT

EnLQML

AmH

NeS

MBL

rIS

RIS

ElL

AnP

AGV

GSMTransantarctic Mountains

EAM

OR

WARS

Ross S.

Weddell S.

Kergue

len P.

Lambert G.

A

C

F

Bal

Bou

STP

Mar

3.8 4.0 4.2 4.4 4.6S-velocity (km/s)

d)