Digitized ridges and transform faults for mature spreading ridge plate boundaries. These ridges were digitized to investigate ridge segmentation versus spreading rate. Offsets in the ridge include any first and second order discontunities as defined by MacDonald et al., [1988]. The 12 segments are defined according to the present-day plate boundaries of DeMets et al., [1994]. The following data were used to estimate the locations of the ridges and offets. (1) previous digitized ridges by Small and Sandwell [1992], Bird et al., [2003], and the USGS. (2) replcated shallow earthquakes magnitude > 5.4 [Engdahl et al., 1997]. (3) Vertical gravity gradient from satellite altimetry [Sandwell and Smith, 2008]. (4) Measured seafloor depth from Becker et al., [2009].

North America - Africa, NOAM-AFRC

South American - Antarctic, SOAM-ANTA

Australian - Antarctic, AUST-ANTA

African - Antarctic, AFRC-ANTA

North American - Eurasian, NOAM-EURA

Indian - African, INDI-AFRC

Pacific - Cocos, PCFC-COCO

Pacific - Nazca, PCFC-NAZC

Pacific - Antarctic, PCFC-ANTA

South American - African, SOAM-AFRC

Nazca - Antarctic, NAZC-ANTA

Pen

AF-AN

AN-AF

SO-AN

SO-IN

AU-SO

EU-AF

EU\AF

EU/AF

IN-SO

NA-AF

AF-SA

AU-AN

AN-NZ

PA-AN

AN-SA

AN\SA

AR-EU

SU/AU

TI-AU

PA-AU

AU\PA

AU-PA

KE/PA

TO/PA

KE-AU

PA-NI

PA-TO

WL-MO

WL-AU

SB/SS

NB/SS

PA/SS

PA/WL

SS\WL

AU-WL

PA/AU

NH/AU

CA-NA

CA/CO

CA-SA

CA/SA

CO\NA

CO-PA

CO-NZ

EU-IN

NA-EU

PA\OK

PA-JF

JF\NA

OK/PA

NA/PA

NA-PA

NA-SA

NZ-PA

NZ\SA

NZ\AP

NZ\ND

ON/PS

AM/PS

OK-PS

PS-CL

PS/PA

MA/PA

KE-TO

NI-FT

NI-AU

TO-NI

TO-AU

SC/AN

SC-AN

SL/AN

SL-AN

SC-SL

AS-AT

AS-EU

AR-AF

AT-AR

EU-AR

AT-EU

OK/NA

OK-NA

OK-EU

OK-AM

AM-EU

EU-SU

YA-SU

BU-EU

IN-EU

BU/IN

BU/AU

EU-YA

AP-SA

PA-NA

RI-PA

NA-RI

NA/RI

RI-CO

PS-YA

PS/SU

PS-SU

PS\SU

SU-BH

BH/SU

MS\SU

MS/SU

MS-BS

MS\BH

BS/SU

BS-SU

BS-AU

MS-BH

BH-BS

BH\BS

SU-TI

BS-TI

BH/CL

BH/PS

AU-MO

AU-BH

MO-BH

SU-BU

IN\BU

IN-BU

MS-SU

EU-NA

IN-AU

ON-PS

YA-ON

AM-ON

EU-AM

AM-YA

CL-PS

PA-CL

CL-NB

PA-NB

CL\WL

WL-BH

NB-SB

NB\WL

NB-MN

MN-SB

SB-WL

WL-SS

PS-MA

NH-PA

CR-NH

NH-AU

BR-NH

BR-CR

AU-CR

BR-AU

PA-BR

FT-AU

FT-PA

EA-PA

EA-NZ

JZ-PA

JZ-AN

JZ-NZ

GP-PA

GP-NZ

GP-CO

PA-CO

SC-SA

SW-SC

SW-AN

SW/SA

AR-IN

IN-AR

SO-AR

AF-AR

AS/AF

AT/AF

SO-AF

AF-SO

PM-CA

NZ-PM

CO\PM

ND/NZ

PM-ND

CA\ND

ND-SA

spreading ridges

NORTH

GULF

SOUTH

CAYMAN

SPREADING

REYKJANES

AZORES

PRESENT

CARLSBERG

CENTRAL

RED

AYU

YAMATO

SOROL

CAROLINE

MARIANA

Southwest

EQUATORIAL

SOUTHEAST

WESTERN

EASTERN

PACIFIC-ANTARCTIC

JUAN

FRACTURE

WOODLARK

MANUS

PACIFIC-GALAPAGOS

PACIFIC-COCOS

PACIFIC-NAZCA

PACIFIC-EASTER

EPR

EXPLORER,

GALAPAGOS-NAZCA

EASTER-NAZCA

COCOS-NAZCA

NAZCA-ANTARCTIC

trenches

TRENCH

MIDDLE

PERU-CHILE

GREATER

PUERTO

SOUTHERNMOST

CHILE

HELLENIC

TRENCH,

INDUS-TSANGPO

NORTHERN

MAIN

MINAB

MAKRAN

MELLIN

DEFORMATION

PHILIPPINE

PALAU

YAP

JAPAN

WEST

THRUST

NEGROS

RYUKU

NANKAI

JAVA

COTABATO

STRIKE-SLIP

SERAM

WETAR

BONIN

NEW

MANOKWARI

TONGA

KERMADEC

SAN

ALEUTIAN

KURIL

extinct spreading ridges

new

transform faults

NW

NE

BOCONO

YUCATAN-HONDURAS

SW

SE

TRANSFORM

VIRGIN

SHACKLETON

OWEN

NAN-UTTARADIT

SAGAING

SS

SUMATRA

EAST

SORONG

ALPINE

WEITIN

WILLAUMEZ

EXTENSIONAL

DJAUL

MENDOCINO

MACQUARIE