Precision alignment of the LIGO 4 km arms using the dual-frequency differential global positioning system

2001 ◽  
Vol 72 (7) ◽  
pp. 3086-3094 ◽  
Author(s):  
W. E. Althouse ◽  
S. D. Hand ◽  
L. K. Jones ◽  
A. Lazzarini ◽  
R. Weiss
Keyword(s):  
Global Positioning System ◽  
Positioning System ◽  
Dual Frequency ◽  
Global Positioning ◽  
Differential Global Positioning System

scholarly journals Global positioning system resurvey of Southern California Seismic Network stations

1995 ◽  
Vol 85 (1) ◽  
pp. 361-374
Author(s):  
Jennifer S. Haase ◽  
Egill Hauksson ◽  
Hiroo Kanamori ◽  
Jim Mori
Keyword(s):  
Global Positioning System ◽  
Southern California ◽  
Seismic Station ◽  
Seismic Network ◽  
Positioning System ◽  
Dual Frequency ◽  
Time Data ◽  
Phase Measurements ◽  
Station Coordinates ◽  
Global Positioning

Abstract Systematic errors in travel-time data from local earthquakes can sometimes be traced to inaccuracies in the published seismic station coordinates. This prompted a resurvey of the stations of the Caltech/USGS Southern California Seismic Network (SCSN) using the Global Positioning System (GPS). We surveyed 241 stations of the SCSN using Trimble and Ashtech dual-frequency GPS receivers and calculated positions accurate to 3 m using differential positioning from carrier phase measurements. Twelve percent of the stations that were surveyed were found to be mislocated by more than 500 m. Stations of the TERRAscope and USC networks were also surveyed, as well as a network of portable seismic stations deployed shortly after the 1992 Joshua Tree and Landers earthquakes. The new coordinates and the offsets from the old coordinates are given below. The new coordinates are being used in SCSN locations as of 1 January 1994.

scholarly journals Compartimentação morfológica de uma planície costeira dominada por Mesomaré em Almofala – Ceará

2015 ◽  
Vol 18 (3) ◽  
Author(s):  
Ponciana Freire de AGUIAR ◽  
Maâmar El Robrini ◽  
George Satander Sá ◽  
Juliana De Sá Guerreiro
Keyword(s):  
Global Positioning System ◽  
Positioning System ◽  
Global Positioning ◽  
Differential Global Positioning System

 A zona costeira de Almofala, com uma faixa de 8 km de largura é condicionada por altas temperaturas (>25ºC), pluviometria média de 1.172,21mm, ventos de 5.5m/s, mesomarés de 1.48 m de amplitude e ondas de 0.56 m de altura. A compartimentação morfológica da Planície Costeira de Almofala foi realizada com base em dados de sensores remotos (Quick Bird, 2004; Landsat 5TM, 2006) para geração de MDT (Modelo Digital de Terreno) por interpolação de krigagem e de mapas temáticos (curvas de nível e declividade), em coleta de pontos X, Y e Z, e perfis topográficos com DGPS (Differential Global Positioning System) e sedimentologia. A planície costeira de Almofala possui o planalto costeiro com tabuleiros costeiros, incluindo tabuleiros litorâneos (8.031.957m2) e plataforma de abrasão (34.654m2); a planície costeira inclui a planície aluvial (planície de inundação e terraços com 944.912m2); planície estuarina (planície fluviolagunar/847.036m2, planície de intermaré/5.782.520m2, canais de maré e delta/66.696m2); e a planície arenosa (dunas fixas/ eolianitos 13.879.382m2, dunas móveis/1.463.971 m2, praias de Almofala, da Barreira e de Torrões/837.031 m2).

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