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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

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

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

tectonic setting
Tectonic Setting:

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

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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