Horizontal to vertical spectral ratio measurements in Port-au-Prince (Haiti) area damaged by the 2010 Haiti earthquake

Benito Oterino, María Belén and Navarro, Manuel and Enomoto, T. and Belizaire, Dwinel and Navarro, D. and García-Jerez, A. and Dorfeuille, Jean Michel Haendel (2013). Horizontal to vertical spectral ratio measurements in Port-au-Prince (Haiti) area damaged by the 2010 Haiti earthquake. In: "2013 Meeting of the Americas, AGU, Cancun, Mexico, 14-17 May", 14/05/2013 - 17/05/2013, Cancún, Mexico. pp..

Description

Title: Horizontal to vertical spectral ratio measurements in Port-au-Prince (Haiti) area damaged by the 2010 Haiti earthquake
Author/s:
  • Benito Oterino, María Belén
  • Navarro, Manuel
  • Enomoto, T.
  • Belizaire, Dwinel
  • Navarro, D.
  • García-Jerez, A.
  • Dorfeuille, Jean Michel Haendel
Item Type: Presentation at Congress or Conference (Poster)
Event Title: 2013 Meeting of the Americas, AGU, Cancun, Mexico, 14-17 May
Event Dates: 14/05/2013 - 17/05/2013
Event Location: Cancún, Mexico
Title of Book: AGU Meeting of the Americas. Cancun, Mexico, 14-17 May
Date: 2013
Subjects:
Freetext Keywords: Earthquake ground motions and engineering seismology
Faculty: E.T.S.I. en Topografía, Geodesia y Cartografía (UPM)
Department: Ingeniería Cartográfica, Geodesia y Fotogrametría [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In order to evaluate ground shaking characteristics due to surface soil layers in the urban area of Port-au-Prince, short-period ambient noise observation has been performed approximately in a 500x500m grid. The HVSR method was applied to this set of 36 ambient noise measurement points to determine a distribution map of soil predominant periods. This map reveals a general increasing trend in the period values, from the Miocene conglomerates in the northern and southern parts of the town to the central and western zones formed of Pleistocene and Holocene alluvial deposits respectively, where the shallow geological materials that cover the basement increase in thickness. Shorter predominant periods (less than 0.3 s) were found in mountainous and neighbouring zones, where the thickness of sediments is smaller whereas longer periods (greater than 0.5 s) appear in Holocene alluvial fans, where the thickness of sediments is larger. The shallow shear-wave velocity structure have been estimated by means of inversion of Rayleigh wave dispersion data obtained from vertical-component array records of ambient noise. The measurements were carried out at one open space located in Holocene alluvial deposits, using 3 regular pentagonal arrays with 5, 10 and 20m respectively. Reliable dispersion curves were retrieved for frequencies between 4.0 and 14 Hz, with phase velocity values ranging from 420m/s down to 270 m/s. Finally, the average shear-wave velocity of the upper 30 m (VS30) was inverted for characterization of this geological unit.

More information

Item ID: 26724
DC Identifier: http://oa.upm.es/26724/
OAI Identifier: oai:oa.upm.es:26724
Official URL: http://moa.agu.org/2013/
Deposited by: Memoria Investigacion
Deposited on: 05 Sep 2014 17:08
Last Modified: 03 Apr 2017 06:41
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