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Higher frequency data products of the International Monitoring System’s infrasound stations

This dataset consists of data products derived from broadband signal detection lists that have been processed for the certified infrasound stations of the International Monitoring System. More specifically, within the CTBT-relevant infrasound range (around 0.01-4 Hz), this dataset covers higher frequencies (1-3 Hz) and is therefore called the ‘hf’ product. The temporal resolution (time step and window length) is 5 min. For processing the infrasound data, the Progressive Multi-Channel Correlation (PMCC) array processing algorithm with a one-third octave frequency band configuration between 0.01 and 4 Hz has been used. The detected signals from the most dominant directions in terms of number of arrivals within a time window and the product-specific frequency range are summarized at predefined time steps. Along with several detection parameters such as the back azimuth, apparent velocity, or mean frequency, additional quantities for assessing the relative quality of the detection parameters are provided. The dataset is available as a compressed .zip file containing the yearly data products (.nc files, NetCDF format) of all certified stations (since 2003). Further information on the processing and details about the open-access data products can be found in: Hupe et al. (2022), IMS infrasound data products for atmospheric studies and civilian applications, Earth System Science Data, doi:10.5194/essd-14-4201-2022

Very low frequency data products of the International Monitoring System’s infrasound stations

This dataset consists of data products derived from broadband signal detection lists that have been processed for the certified infrasound stations of the International Monitoring System. More specifically, this dataset, called the ‘maw’ product, covers a very low frequency range of infrasound (0.02-0.07 Hz). The temporal resolution (time step and window length) is 30 min. For processing the infrasound data, the Progressive Multi-Channel Correlation (PMCC) array processing algorithm with a one-third octave frequency band configuration between 0.01 and 4 Hz has been used. The detected signals from the most dominant directions in terms of number of arrivals within a time window and the product-specific frequency range are summarized at predefined time steps. Along with several detection parameters such as the back azimuth, apparent velocity, or mean frequency, additional quantities for assessing the relative quality of the detection parameters are provided. The dataset is available as a compressed .zip file containing the yearly data products (.nc files, NetCDF format) of all certified stations (since 2003). Further information on the processing and details about the open-access data products can be found in: Hupe et al. (2022), IMS infrasound data products for atmospheric studies and civilian applications, Earth System Science Data, doi:10.5194/essd-14-4201-2022.

Microbarom high-frequency data products of the International Monitoring System’s infrasound stations

This dataset consists of data products derived from broadband signal detection lists that have been processed for the certified infrasound stations of the International Monitoring System. More specifically, this dataset covers, among other phenomena, the upper frequency range of microbaroms (0.45-0.65 Hz) and is therefore called the ‘mb_hf’ product. The temporal resolution (time step and window length) is 15 min. For processing the infrasound data, the Progressive Multi-Channel Correlation (PMCC) array processing algorithm with a one-third octave frequency band configuration between 0.01 and 4 Hz has been used. The detected signals from the most dominant directions in terms of number of arrivals within a time window and the product-specific frequency range are summarized at predefined time steps. Along with several detection parameters such as the back azimuth, apparent velocity, or mean frequency, additional quantities for assessing the relative quality of the detection parameters are provided. The dataset is available as a compressed .zip file containing the yearly data products (.nc files, NetCDF format) of all certified stations (since 2003). Further information on the processing and details about the open-access data products can be found in: Hupe et al. (2022), IMS infrasound data products for atmospheric studies and civilian applications, Earth System Science Data, doi:10.5194/essd-14-4201-2022

Microbarom low-frequency data products of the International Monitoring System’s infrasound stations

This dataset consists of data products derived from broadband signal detection lists that have been processed for the certified infrasound stations of the International Monitoring System. More specifically, this dataset covers the dominant frequency range of microbaroms (0.15-0.35 Hz) and is therefore called the ‘mb_lf’ product. The temporal resolution (time step and window length) is 15 min. For processing the infrasound data, the Progressive Multi-Channel Correlation (PMCC) array processing algorithm with a one-third octave frequency band configuration between 0.01 and 4 Hz has been used. The detected signals from the most dominant directions in terms of number of arrivals within a time window and the product-specific frequency range are summarized at predefined time steps. Along with several detection parameters such as the back azimuth, apparent velocity, or mean frequency, additional quantities for assessing the relative quality of the detection parameters are provided. The dataset is available as a compressed .zip file containing the yearly data products (.nc files, NetCDF format) of all certified stations (since 2003). Further information on the processing and details about the open-access data products can be found in: Hupe et al. (2022), IMS infrasound data products for atmospheric studies and civilian applications, Earth System Science Data, doi:10.5194/essd-14-4201-2022

Global reference histograms of the IMS infrasound broadband detection lists

This data set builds upon the broadband detection lists of the International Monitoring System (IMS)’s infrasound stations. The infrasound data of these stations are regularly (re-)processed at the German National Data Centre at BGR (e.g., Ceranna et al., 2019; https://doi.org/10.1007/978-3-319-75140-5_13) using the Progressive Multi-Channel Correlation (PMCC) array processing method (Cansi, 1995; https://doi.org/10.1029/95GL00468). The latest reprocessing with 26 one-third octave spaced frequency bands in the IMS band of interest (0.01 to 4 Hz) included all 53 stations that were certified within the period 2003 to 2020. Based on the resulting broadband detection lists, this data set expands on former analyses of the coherent ambient noise. For each station with a data availability of at least one year (by the end of 2020), monthly reference histograms for the detection parameters back azimuth, apparent speed, and root-mean-squared amplitude are provided. The histograms provide a means to determine the deviation from nominal monthly behaviour and thus enable assessing the plausibility of detections and potential anomalies – without determining their cause – in the detected parameters. Overall, these quality metrics will be, among other applications, a useful supplement to the open-access IMS infrasound data products provided by Hupe et al., which are also available in BGR’s product centre. Further details of the reference histograms are described in the following publication by Kristoffersen et al.: "Updated global reference models of broadband coherent infrasound signals for atmospheric studies and civilian applications" (https://doi.org/10.1029/2022EA002222).

GIS Maps Portal at AWI

This portal provides an overview of GIS-products at AWI. maps@awi stores and shares public access GIS data created by AWI projects.

World Stress Map Database Release 2025

The World Stress Map (WSM) is a global compilation of information on the crustal present-day stress field. It is a collaborative project between academia and industry that aims to characterize the stress pattern and to understand the stress sources. It commenced in 1986 as a project of the International Lithosphere Program under the leadership of Mary-Lou Zoback. From 1995-2008 it was a project of the Heidelberg Academy of Sciences and Humanities headed first by Karl Fuchs and then by Friedemann Wenzel. Since 2009 the WSM is maintained at the GFZ Helmholtz Centre for Geosciences. The WSM database release 2025 contains 100,842 data records within the Earth’s crust. The data are provided in two formats: Excel-file (wsm2025.xlsx) and comma separated fields (wsm2025.csv). Data records with reliable A-C quality are displayed in the World Stress Map (doi:10.5880/WSM.2025.002). Further detailed information on the WSM quality ranking scheme 2025, guidelines for the analysis of borehole logging data, and software for stress map generation and the stress pattern analysis is available at www.world-stress-map.org. The database structure and content is explained in the WSM Technical Report TR 25-01 (https://doi.org/10.48440/wsm.2025.001).

Geophysikalische Untersuchungen von Beckenstrukturen und Sedimentinventar in der Inneren Mongolei, NW China

Dieses Projekt ist ein Teil des DFG-Bündelprojektes 'Rekonstruktiondes spätpleistozänen und holozänen Environments in der westlichen Inneren Mongolei, NW-China'. Zur Klärung der tektonischen, sedimentologischen und hydrogeologischen Entwicklung eines Sedimentbeckens in der Badain Jaran Shamao werden in einem multimethodischen Ansatz elektrisch-elektromagnetische Messungen durchgeführt (Spektrale Induzierte Polarisation, Magnetotellurik, Transiente Elektromagnetik, Bodenradar, Geoelektrik). Aufbauend auf langjährigen Erfahrungen in Wüstengebieten sind optimierte multimethodische Messstrategien und Methoden zur gemeinsamen Inversion der verschiedenen Meßdaten weiter zu entwickeln. Das Vorhaben ist Teil eines interdisziplinären Bündelantrages (Paläoklimatologie, Hydrogeologie, Strukturgeologie, Fernerkundung, Bodenkunde). Hauptforschungsziel des Gesamtantrages ist die Klärung der Frage, ob in Nordafrika nachgewiesene spätquartäre abrupte Klimawechsel in den zentralasiatischen Wüsten einen kontemporären Verlauf zeigen. Ziel: Das Ziel des Projektes ergibt sich aus der Frage, ob in Nordafrika nachgewiesene, spätquartäre, abrupte Klimawechsel in den zentralasiatischen Wüsten einen kontemporären Verlauf zeigen. Seitdem die afrikanische Platte etwa die heutige geographische Position erreicht hat und das tibetische Plateau eine bedeutende Höhenlage entwickelte, besteht ein von letzterem ausgehender, hochtroposphärische Strahlstrom, welcher zu einem Delta über Nordafrika führt mit der Folge der weitgehenden Unterdrückung der für die übrigen Wüstengebiete charakteristischen Sommerniederschläge. Es ist daher von besonderem Interesse zu wissen, ob die am Nordrand des tibetischen Plateaus gelegenen Wüstengebiete eine korrelate Änderung des Environments erfuhren, da die Albedo über dem tibetischen Plateau und seinen Randgebieten Rückwirkungen auf die Zirkulation über den altweltlichen Wüstengürteln zur Folge haben müsste. Deren Steuerung durch Vergletscherung, Vegetationsbedeckung und topographische Position müsste sich in den fluvialen Akkumulationsräumen in den ariden Gebieten nördlich Tibets abzeichnen. Sie bieten besonders günstige Voraussetzungen, da sie wahrscheinlich seit dem Beginn des Quartärs geschlossene und langfristig endorheische Becken darstellen, in denen zeitweise ausgedehnte Endseen entstanden. Die Sedimentmächtigkeit überschreitet nach Vorstudien 230m. Es handelt sich um feinklastische Sedimente, die zum Teil rhythmisch geschichtete sind und einen Zeitraum von 800.000 Jahren überspannen. Es ist eine Feinauflösung sowohl der potamologischen, äolischen wie limnologischen Sedimentführung auf die klimatisch gesteuerten Einträge zu erwarten. Insofern erweisen sich die Sedimentationsräume als Archive für die klimatisch und gegebenenfalls tektonisch gesteuerte Variabilität und Entwicklung innerhalb des tibetischen Orogens und seines nördlichen Vorlandes. (...)

Bestimmung der hydraulischen Durchlaessigkeit quartaerer Sedimente mit geophysikalischen Verfahren

Bindige Deckschichten mit geringer hydraulischer Durchlaessigkeit gewaehrleisten den Schutz oberflaechennaher Grundwasserleiter vor Kontaminationen. Das Hauptkriterium fuer diese Schutzwirkung ist der Tongehalt, der einen entscheidenden Einfluss auf die hydraulische Leitfaehigkeit hat. Es sollen Verfahren entwickelt werden, die eine schnelle Kartierung des Tongehaltes mit geophysikalischen Verfahren ermoeglichen. Als Verfahren kommen dabei geoelektrische und elektromagnetische Methoden in Betracht. Bestehende Theorien ueber den Einfluss des Tongehaltes auf die elektrische Leitfaehigkeit werden in Bezug auf ihre Verwendbarkeit in der Praxis umgearbeitet. Feldarbeiten hierzu werden an ausgewaehlten Lokationen in Schleswig-Holstein und Ungarn durchgefuehrt.

Infrasonic Signatures of 1001 Rocket Launches for Space Missions

Rocket launches for space missions are well-defined ground-truth events generating strong infrasonic signatures. This data set covers ground-truth information for 1001 rocket launches from 27 global spaceports between 2009 and mid-2020. Infrasound signatures from up to 73% of the launches were identified at infrasound arrays of the International Monitoring System. The detection parameters were obtained using the Progressive Multi-Channel Correlation (PMCC) algorithm. Propagation and quality parameters supplement the PMCC detection parameters in this dataset. The results are provided for further use as a ground-truth reference in geophysical and atmospheric research. The open-access publication “1001 Rocket Launches for Space Missions and their Infrasonic Signature” (Pilger et al., 2021, Geophys. Res. Letters, doi:10.1029/2020GL092262) provides further details on this data set. Data format: The data are provided both as ASCII files (separate lists of infrasound signatures and rocket launch events, plus README files) and as a comprehensive netCDF file.

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