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SOPAC's Instantaneous Global Plate Motion Model:. Contributions to a North America Fixed Reference Frame. Yehuda Bock, Linette Prawirodirdjo, Peng Fang, Paul Jamason, Shimon Wdowinski (TAU, UMiami) Scripps Orbit and Permanent Array Center Institute of Geophysics and Planetary Physics

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Sopac s instantaneous global plate motion model
SOPAC's Instantaneous Global Plate Motion Model:

Contributions to a North America Fixed Reference Frame

Yehuda Bock, Linette Prawirodirdjo, Peng Fang, Paul Jamason, Shimon Wdowinski (TAU, UMiami)

Scripps Orbit and Permanent Array Center

Institute of Geophysics and Planetary Physics

Scripps Institution of Oceanography

University of California San Diego

La Jolla, California

2004 Joint Assembly

Montreal, CANADA

May 18, 2004


Sopac s instantaneous global plate motion model

Introduction

  • SOPAC estimates monthly a global plate motion model (17 major and minor plates) based on its daily CGPS position time series.

  • Longest time series are 13 years old, beginning during the “GIG” experiment in January 1991. Shortest time series are about 4 years old.

  • Plate motion model is based on CGPS stations whose data are publicly available so that it can be easily used/replicated by other researchers.


Sopac s instantaneous global plate motion model

GPS Data Analysis

  • Entire daily time series have been re-estimated by SOPAC in a consistent manner after a reconciliation of all site metadata in the SOPAC archive.

  • Time series are from 24-hour GAMIT solutions of 20 sub-networks, including 4 global and 16 regional sub-networks with overlapping sites.

  • Sub-networks are combined daily with the GLOBK glorg module, aligned by a 7-parameter similarity transformation to ITRF2000 as realized by the IGS, thereby maintaining the No-Net-Rotation condition of ITRF2000 wrt to NNR-NUVEL-1A.


Sopac s instantaneous global plate motion model

Time Series Analysis

  • Modeled with linear rates (velocities), annual and semi-annual parameters, offsets (instrumental and coseismic), and postseismic decay.

  • Coefficients of a white noise plus flicker noise model are estimated by MLE approach, and propagated to uncertainties of time series parameters.


Sopac s instantaneous global plate motion model

13-Year Daily (Unfiltered) Time Series at PIN1 & PIN2

PIN1 velocities:

N5.4±0.5;8.0±0.8

E-27.1±0.6;-27.0±0.8

U2.8±1.7;2.7±2.6

PIN2 velocities:

N5.4±0.5;7.5±0.7

E-27.4±0.7;-26.6±1.0

U2.6±1.3;4.1±1.9

RMS:

H 3-4mm;V 9mm




Sopac s instantaneous global plate motion model

Plate Motion Model

  • Stations that exhibit “anomalous” behavior are excluded (e.g., elastic and seismic deformation, significant vertical motion).

  • Estimate Euler poles by minimizing site velocities relative to ITRF2000.

  • Include in the rigid plate motion estimates only stations whose velocity residuals are less than the 2 s velocity uncertainties.

  • This leaves us with about 110 global sites.


Sopac s instantaneous global plate motion model

Velocity differences between SOPAC and ITRF velocities and comparison of velocity error ellipses – 95% confidence).


Sopac s instantaneous global plate motion model

Vertical Motions comparison of velocity error ellipses – 95% confidence).


Sopac s instantaneous global plate motion model

SOPAC Plate Motion Model comparison of velocity error ellipses – 95% confidence).


Sopac s instantaneous global plate motion model

North America Reference Frame comparison of velocity error ellipses – 95% confidence).


Sopac s instantaneous global plate motion model

Examples of Use of Plate Motion Model comparison of velocity error ellipses – 95% confidence).


Sopac online map interface
SOPAC Online Map Interface comparison of velocity error ellipses – 95% confidence).


Sopac s instantaneous global plate motion model

Analysis of SCEC III Crustal Motion Model comparison of velocity error ellipses – 95% confidence).

Shen et al., 2003


Sopac s instantaneous global plate motion model

LatitudinalComponent comparison of velocity error ellipses – 95% confidence).

Longitudinal Component


Sopac s instantaneous global plate motion model

California Spatial Reference Center (CSRC) comparison of velocity error ellipses – 95% confidence).

  • Provide the necessary geodetic services to ensure the availability of accurate, consistent, and timely spatial referencing data.

  • Monitor temporal changes in geodetic coordinates due to tectonic motion, earthquakes, volcanic deformation and land subsidence.

  • Establish the legal spatial reference system for California (the “CSRS”).


California spatial reference system
California Spatial Reference System comparison of velocity error ellipses – 95% confidence).


Sector and csrs epoch 2004 0
SECTOR and CSRS Epoch 2004.0 comparison of velocity error ellipses – 95% confidence).

CSRS Epoch 2004.0 is defined as the coordinates (and velocities) computed by CSRC on 14 April 2004 using data up to an including 27 March 2004, and will not change.


Sopac s instantaneous global plate motion model

Monthly SOPAC PMM Updates comparison of velocity error ellipses – 95% confidence).

  • SOPAC estimates monthly a global plate motion model (17 major and minor plates) to improve precision and reliability as new data become available.

  • Plate motion model is based on CGPS stations whose data are publicly available so that it can be easily used/replicated by other researchers.

  • The SOPAC PMM provides a baseline against which anomalous motions (tectonic or otherwise) can be detected.