Jamaican seismicity tectonics
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Jamaican Seismicity & Tectonics. Margaret D. Wiggins-Grandison Earthquake Unit University of the West Indies- Mona Jamaica. Contents. The Earthquake Unit Historical earthquakes Recent significant earthquake Tectonic setting Current seismicity Research and development. Introduction.

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Jamaican Seismicity & Tectonics

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Jamaican seismicity tectonics

Jamaican Seismicity & Tectonics

Margaret D. Wiggins-Grandison

Earthquake Unit

University of the West Indies- Mona

Jamaica

MDWG-IRIS_July 2006


Contents

Contents

  • The Earthquake Unit

  • Historical earthquakes

  • Recent significant earthquake

  • Tectonic setting

  • Current seismicity

  • Research and development

MDWG-IRIS_July 2006


Introduction

Introduction

  • Xaymaca = land of wood & water

  • Location = 18 N, 76-78 W ~400 km E of Grand Cayman, 150 km S of SE Cuba

  • 1494 – 1655: Spanish colony

  • 1655 – 1962: British colony

  • 1962 – present: independent country in the British commonwealth

  • Area = 240 x 90 km2

  • Very mountainous: >2000 m in east; ~1000 m elsewhere

  • Rain forest NE and NC; semi-arid SC & SW

  • Population: 2.6- 2.7 million resident [another 2M elsewhere]

MDWG-IRIS_July 2006


The earthquake unit

The Earthquake Unit

  • operate the Jamaica Seismograph Network (JSN) [12 stations, 8 accelerographs]

  • maintain a database of all earthquakes recorded by the JSN

  • inform the public about recent earthquakes

  • collect information about effects of earthquakes felt in Jamaica

  • conduct research on the seismicity, seismic hazard, site response and vibration analyses & related fields

  • Exchange data with international and regional networks

  • Jamaica’s National Data Centre of the Comprehensive (Nuclear) Test-Ban Treaty Organization’s (CTBTO) International Data Centre

  • Welcome visits from school & community groups

MDWG-IRIS_July 2006


The jamaica seismograph network

The Jamaica Seismograph Network

  • Sensors: Mark L4 1Hertz

  • Geotech analogue electronics: HP 0.2 Hz 2 pole; LP 12.5Hz 2 pole filters

  • UHF telemetry

  • 4 three-component stations

  • GII SDA & SDP plus SEISAN – 16-bit 50sps

MDWG-IRIS_July 2006


Historical earthquakes

Historical Earthquakes

Eastern Jamaica

  • 1692 (X)

  • 1771 (VII)

  • 1812 (VIII)

  • 1907 (IX)

  • 1914 (VII)

  • 1993 (VII)

Western Jamaica

  • 1839 (VII)

  • 1943 (VII)

  • 1957 (VIII)

MDWG-IRIS_July 2006


1692 june 7 port royal m 1907 jan 14 kingston ms 6 5

1692 (June 7) Port Royal M? 1907 (Jan 14) Kingston Ms 6.5

MDWG-IRIS_July 2006


Aenon town central jamaica june 12 2005 m 5 1

Aenon Town,Central JamaicaJune 12, 2005, M 5.1

MDWG-IRIS_July 2006


June 12 damage toppled cockpit summit frazier sw st ann

June 12 Damage - Toppled Cockpit summit - Frazier, SW St. Ann

MDWG-IRIS_July 2006


House damage june 12 l emon walk trelawny top alston clarendon grant s bailey st ann

House Damage – June 12 - Lemon Walk, Trelawny; Top Alston, Clarendon; Grant’s Bailey, St. Ann

MDWG-IRIS_July 2006


Jamaican earthquakes per century

Jamaican earthquakes per century

MDWG-IRIS_July 2006


Tectonic setting

Tectonic Setting:

MDWG-IRIS_July 2006


Northern caribbean seismicity tectonics

Northern Caribbean Seismicity & Tectonics

MDWG-IRIS_July 2006


Jamaican seismicity

Jamaican seismicity

NJF North Jamaica

WFZ Walton

DFZ Duanvale

RMCR Rio Minho-Crawle River

MNB Montpelier-Newmarket

WWB Wagwater

YPG Yallahs- Plantain Garden

SCr Santa Cruz

ST Spur Tree

SoC South Coast

BM Blue Mountain

MDWG-IRIS_July 2006


Stress orientation in the crust from microseismicity

Stress orientation in the crust from microseismicity

MDWG-IRIS_July 2006


Gps and seismic stations

GPS and seismic stations

MDWG-IRIS_July 2006


Summary

Summary

  • The northern Caribbean plate boundary deforms by left-lateral strike-slip

  • There is a Gonave microplate. Gonave-caribbean slip rate 8 – 13 mm/yr; Gonave-North American slip 6-11 mm/yr.

  • The slip rates are relatively slow implying long return periods of potentially devastating earthquakes

MDWG-IRIS_July 2006


The end

THE END

MDWG-IRIS_July 2006


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