What is a seismic housing
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Central Germany Seismology Association
Earthquake Observation Reports
Seismometers register earthquakes. A seismometer is a device that can record ground vibrations from earthquakes and other seismic waves. It consists of a mass that is mounted on a spring suspension. While the ground movement is transferred to the housing of the instrument, the mass remains at rest due to its inertia. The relative movement of the ground can thus be measured as a change in length over time. Since the earthquake waves propagate in the interior of the earth, a network of several seismometers can be used to determine the location of an earthquake focus and the strength of an earthquake. That is why there are networks of seismological stations around the world.
Seismic surveillance in central Germany
In Central Germany, state earthquake monitoring is practiced in agreement with the seismological observatories and facilities in the "Seismology Association for Earthquake Observation in Central Germany", which uses the existing experience and knowledge as well as the existing seismological observatories and stations. The Saxon State Office for Environment, Agriculture and Geology (LfULG) takes on the coordination within the seismology network and is the official contact for state and public bodies.
In the Seismology Association, legally and financially independent institutions are united with the aim of coordinating the regional seismological work in Saxony, maintaining the existing observation network and expanding it in a targeted manner.
As part of theSeismology association for earthquake observation in Central Germany the recordings of the seismological monitoring networks are automatically recorded. For this purpose, the signals from around 50 seismic measuring stations are continuously and automatically registered and evaluated for the region of Central Germany / North-West Bohemia. This is done with the help of an automatic location system with which the parameters of earthquakes can be determined immediately. The high density of seismic stations guarantees a high level of localization accuracy.
The following parameters are determined:
- the hearth area (region of the quake)
- the hearth time (start of the quake)
- the preliminary magnitude (strength of the quake
The automatically reported events from a magnitude of 2.5 appear on the joint website of the Seismology Association. The automatically determined parameters are only secured once they have been confirmed by a seismologist.
If the manual confirmation has been given by a seismologist, the quake and the parameters can be found in the preliminary list of earthquake data of the Saxony network and on the joint website of the seismology network; at the same time, the automatically determined event is not displayed.
- Expansion, optimization and operation of a seismic station network
- rapid determination of epicentres, magnitudes and other focus parameters in the case of stronger events
- Providing up-to-date information to government agencies, the media and the population
- Monitoring of seismically active areas to improve the database for risk analyzes and to create seismicity maps
- Statements on site-specific seismic risks and engineering seismological investigations
- Investigation of tectonically active areas and crustal deformations
- Investigations into the influence of wind turbines on seismological measurements
Various interactive maps and tables on the topic of seismology can be viewed on the Antares data and map server, e.g .:
- Map with the seismic stations
- List of seismic events since 2009
- Map of seismic events over the past year
- Map of seismic events larger than magnitude 2
Since 1998, the work results of the Seismology Association have been published in the form of two and three-year reports on earthquake observation. The publications can be found under the keyword earthquake observation on the Saxon publication server.
Seismic surveillance in Saxony
The seismic stations in Saxony are being upgraded and operated by the LfULG as part of the Seismological Saxony Network (SXNET). The Saxon network consists of two independent networks: an online network and an offline network.
The online network is maintained by the Institute for Geophysics and Geology at the University of Leipzig. It currently (as of 2016) consists of 10 Saxon stations and 3 stations from the State Office for Mining and Geology in Saxony-Anhalt, which transfer their data directly to the data center at the University of Leipzig. This enables immediate information on seismic events and the current data is made available on the Internet. The equipment of the stations is compatible with the German Regional Seismological Network, and the necessary data exchange is thus possible.
The offline network currently consists of 13 mobile stations. The mobile stations register autonomously if a previously defined ground vibration threshold is exceeded at the respective location. The data must be collected and processed approx. Every 2 months (earlier if necessary). This network is used to carry out targeted evaluations of specific locations, the focus localization and the propagation and investigation of the earthquake waves.
Geodetic monitoring network in the Vogtland earthquake area
The change in the geometry of the earth's surface over time is of particular interest for the investigation of earthquakes. Therefore, in the summer of 1994, the TU Dresden started to set up a geodetic monitoring network in the upper Vogtland.
The geodetic monitoring network extends in the north from Falkenstein to Carlsfeld in the Ore Mountains, along the border with the Czech Republic and via Schönberg in the south to Eichigt in the west. Its extension is about 35 kilometers in a north-south direction and about 30 kilometers in a west-east direction.
It comprises 16 point groups and almost completely covers the Saxon part of the earthquake region Vogtland / NW Bohemia. Each point group consists of at least three individual, mostly underground, measuring points in order to be able to reliably detect any local changes to a point.
Since the network was set up, a total of 6 measurement campaigns have been carried out and the results have been compared with one another. The measurements were taken both in times of low seismic activity (1994-2000) and during and after the 2000 earthquake swarm with strong earthquake activity. Temporal changes in the geometry of the earth's surface can be derived from the comparison of successive GPS measurement campaigns.
A summary of the corrected values of all measurement campaigns shows that the relative movements of the points are less than 0.4 mm / year. In the period from 1994 to 2007, changes in geometry (caused by earthquakes) of less than 1 cm were detected in the study area, but these are not directional.
An evaluation of all measurement campaigns shows that the relative movements of the points are less than 0.4 mm / year. In the period from 1994 to 2007, changes in geometry of less than 1 cm caused by earthquakes were detected in the study area, but these are not directional.
For a high temporal resolution of any existing deformation processes, this network is only suitable to a limited extent, since the individual measuring points were observed discontinuously.
In order to be able to record recent crustal deformations with a high temporal resolution, continuous measurements were carried out at two GPS permanent stations in 2000. The two stations, Neustadt and Grünbach, located south of Falkenstein, recorded possible movements in the north and east direction over a base length of 2.6 km and in the range of a few millimeters in height.
Rates of change (trend) of the north, east and height components of the Neustadt - Grünbach vector in the topocentric coordinate system.
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