A5075946724- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Statistical and numerical algorithms
- Inertial Sensor and Navigation
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Spacecraft and Cryogenic Technologies
- Solar and Space Plasma Dynamics
- Geological Formations and Processes Exploration
- Historical Geography and Cartography
- Scientific Measurement and Uncertainty Evaluation
- Cryospheric studies and observations
- Geophysical and Geoelectrical Methods
- Geological Modeling and Analysis
- Reservoir Engineering and Simulation Methods
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Groundwater and Isotope Geochemistry
- Marine and environmental studies
- Pulsars and Gravitational Waves Research
- Soil Geostatistics and Mapping
- Ship Hydrodynamics and Maneuverability
Finnish Geospatial Research Institute
2012-2023
European Center for Geodynamics and Seismology
2005
The 8th International Comparison of Absolute Gravimeters (ICAG2009) took place at the headquarters Bureau Weights and Measures (BIPM) from September to October 2009. It was first ICAG organized as a key comparison in framework CIPM Mutual Recognition Arrangement Committee for (CIPM MRA) 1999). ICAG2009 composed Key (KC) defined by MRA, Consultative Mass Related Quantities (CCM) designated CCM.G-K1. Participating gravimeters their operators came national metrology institutes (NMIs) or (DIs)...
The validation of compatibility and long-term stability absolute gravimeters is a key component for the realization International Terrestrial Gravity Reference Frame (ITGRF) IAG relevant metrology, in particular kilogram. Because natural reference value gravity acceleration not accessible, international comparisons are well established. realized based on set accurate measurements functional model their processing. After CCM.G-K2.2023 comparison supplemented by additional ICAG-2023...
The CCM.G-K2.2017 comparison was organised for the purpose of determination degree equivalence national standards free-fall acceleration measurement. held in Changping Campus National Institute Metrology China (NIM), from October to November 2017. This is first time that such a organized outside Europe continent and establishes new global sites China. also largest ever with participation 13 instruments. We give list participants who actually performed measurements during comparison, data...
The Bureau International des Poids et Mesures (BIPM), Sèvres, France, hosted the 7th Comparison of Absolute Gravimeters (ICAG) and associated Relative Gravity Campaign (RGC) from August to September 2005. ICAG 2005 was prepared performed as a metrological pilot study, which aimed: (1) To determine gravity comparison reference values; (2) offsets absolute gravimeters; (3) As study accumulate experience for CIPM Key Comparisons. This document presents complete extensive review technical...
For the first time, we present a complete, processed compilation of all repeated absolute gravity (AG) observations in Fennoscandian postglacial land uplift area and assess their ability to accurately describe secular change, induced by glacial isostatic adjustment (GIA). The data set spans over more than three decades consists 688 separate at 59 stations. Ten different organizations have contributed with measurements using 14 instruments. work was coordinated Nordic Geodetic Commission...
Abstract The signal leakage effect in the use of Gravity Recovery and Climate Experiment (GRACE) level‐2 products limits accuracy mass inversion, especially small spatial scales (less than ∼100,000 km 2 ). In this study, we try to GRACE observation evaluate basin changes Finland, where basins are quite 93,000 ) accurate inversion is challenging. To end, carry out a series numerical simulation experiments optimize parameters methods. We propose hybrid strategy, which takes differences both...
The deduction of a regularly spaced gravity anomaly grid from scattered survey data is studied, addressing mainly two aspects: reduction to anomalies and subsequent interpolation by various methods. problem illustrated in heterogeneous study area contrasting test areas including mountains, low terrains, marine area. Provided with realistic error estimates, Least Squares Collocation Residual Terrain Model yields the highest quality grid. In most cases, Bouguer other methods tested are equally...
Abstract Postglacial rebound in Fennoscandia causes striking trends gravity measurements of the area. We present time series absolute data collected between 1976 and 2019 on 12 stations Finland with different types instruments. First, we determine at each station analyse effect instrument types. estimate, for example, an offset 6.8 μgal JILAg-5 respect to FG5-type Applying offsets trend analysis strengthens being good agreement NKG2016LU_gdot model change. Trends seven were found robust used...
In the framework of regional EURAMET.M.G-K2 comparison absolute gravimeters, 17 gravimeters were compared in November 2015. Four from different NMIs and DIs, they used to link CCM.G.K2 by means linking converter. Combined least-squares adjustments with weighted constraint was determine KCRV. Several pilot solutions are presented official solution demonstrate influences approaches (e.g. definition weights constraint) on results adjustment. case solution, all equivalence declared...
Abstract A wide range of mass gain in the inland Tibetan Plateau (TP) has been observed by Gravity Recovery and Climate Experiment (GRACE). But there are still controversies on how to understand this phenomenon. In paper, satellite geodesy data hydrological models combined applied for extracting signals caused tectonic processes TP during period from 2003 2009. We find that three regions with a significant signal should be attributed processes. The prominent signals, each located western,...
Gravity observations made over the Groningen gasfield from 1978 onwards are available. The existing gravity data were reanalysed and a new survey was carried out. observed changes obtained during four surveys, spanning an 18‐year period, compared with effect due to natural gas extraction computed reservoir model production data. random error in values is small enough detect of after few years (up 2 μgal/year). trends calculated agree well within their expected margins statistical snooping....
Earthquake prediction by using total electron content is a commonly used seismic research method. The long short-term memory model kind of method to predict time series and has been for the content, relative power spectrum one pre-seismic infrared anomaly detection algorithms in frequency domain. In this paper, new combining these two extract abnormal signals; thus scientists can more easily detect anomalies similar those before Qinghai Yunnan earthquakes happened on 21 May 2021. There are...
The regional key comparison of absolute gravimeters, EURAMET.M.G-K3 and the simultaneously organized additional comparison, was held in Germany at Geodetic Observatory Wettzell German Federal Agency for Cartography Geodesy spring 2018. Here we present list participants who actually performed measurements during data submitted by operators as well results determination gravity a function height sites. measurement strategy is briefly discussed harmonization documented. Finally, constrained...
We studied geoid validation using ship-borne global navigation satellite systems (GNSS) on the Baltic Sea. obtained heights by combining GNSS–inertial measurement unit observations, tide gauge data, and a physical sea model. used two different models available for area. The ship route was divided into lines were processed separately. GNSS results reduced to surface attitude draft parameters from vessel during campaign. For these lines, residual errors between ellipsoidal height versus...
SUMMARY The Gravity Recovery and Climate Experiment (GRACE) satellite gravimetry observations have been widely used in the study of glaciers. However, there is still no detailed GRACE-based glaciers over Scandinavian Mountains (SCAMs), where are debris-covered effects glacial isostatic adjustment (GIA) significant. In this paper, GRACE combined with climate data to analyse interannual mass changes glacier lake areas Scandinavia during period from 2003 2016. An inversion algorithm,...
Abstract The gravity satellite mission GOCE made its final observations in the fall of 2013. Since re-entry to Earth’s atmosphere, full cycle data has been published by ESA. At first, we evaluated all GOCE-based global geoid models over Finland using terrestrial and GNSS-levelling data. most suitable model was selected as a background for Finnish quasi-geoid calculations. Next, combined chosen with surrounding areas. Quasi-geoid different modifications were calculated DIR5 up spherical...