Zobrazeno 1 - 10 of 20 pro vyhledávání: '"Erhard Wielandt"'
1
Development of instruments for the detection and recording of seismic signals. Metadata of the seismological networks of the Latin American and Caribbean region
Autor: Erhard Wielandt, Carlos A. Vargas, Alexander Caneva
Publikováno v: Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales, Volume: 45, Issue: 174, Pages: 313-332, Published: 18 SEP 2021
Resumen En el presente trabajo se hace una breve descripción del desarrollo de los instrumentos de detección y de registro de señales sísmicas, considerando algunos aspectos técnicos e históricos. Esta descripción parte de los primeros sismosc
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bd1fa3d8ad8743ebc4ad394c16b09d3
https://doi.org/10.18257/raccefyn.1166
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3
Measuring Seismometer Nonlinearity on a Shake Table
Autor: Mark A. Zumberge, Erhard Wielandt
Publikováno v: Bulletin of the Seismological Society of America. 103:2247-2256
We have measured the nonlinear distortion in six broadband seismometers on the vertical shake table at the Institute of Geophysics and Planetary Physics La Jolla: a vertical STS1, three STS2s, a CMG‐3T, and a Trillium 240. In each case, low‐frequ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fba9593deac02e5d7f59ef2b48f2e6e5
https://doi.org/10.1785/0120120325
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4
Magnetic field background variations can limit the resolution of seismic broad-band sensors
Autor: Mark Jonathan Brice Hayman, Rudolf Widmer-Schnidrig, Erhard Wielandt, Nicholas Jason Ackerley, Thomas Forbriger
Publikováno v: Geophysical Journal International. 183:303-312
Analysing magnetic field recordings from a quiet period in January 2007 we find that seismometers with a sensitivity to horizontal component of magnetic field larger than 0.2 m/s/s/T would not be able to resolve the NLNM (New Low Noise Model, Peterso
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::24ed8aec74ac9df4e1ddc75c42054b4e
https://doi.org/10.1111/j.1365-246x.2010.04719.x
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5
An Optical Seismometer without Force Feedback
Autor: Jose Otero, Erhard Wielandt, Mark A. Zumberge, Jonathan Berger
Publikováno v: Bulletin of the Seismological Society of America. 100:598-605
We are developing a new vertical seismometer, motivated by a desire to have an instrument whose performance is similar to that of observatory sensors yet can operate within a borehole without electronics. This has led us to an all-optical seismometer
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff3e7741c041e3467442df8b6dd8cc92
https://doi.org/10.1785/0120090136
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6
On the minimum of vertical seismic noise near 3 mHz
Autor: W. Zürn, Erhard Wielandt
Publikováno v: Geophysical Journal International. 168:647-658
SUMMARY Acceleration power spectral densities of vertical seismic noise at the best seismic stations show a minimum near 3 mHz. We suggest that this minimum is caused by a cancellation near this frequency of Newtonian attraction vs. free air and iner
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::43051d59c98ff60d11517dca05bf1a21
https://doi.org/10.1111/j.1365-246x.2006.03189.x
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7
Signale aus der Erde: Schulseismometer
Autor: Sebastian Schork, Ulrich Arndt, Erhard Wielandt
Publikováno v: Physik in unserer Zeit. 37:281-285
Seit 1994 betreibt das Monschauer St.-Michael-Gymnasium ein Schulseismometer, wissenschaftlich begleitet von Geophysikern der Universitat Stuttgart. Seitdem werten Schuler Erdbeben rund um den Globus aus und werden Zeugen dramatischer Ereignisse. Mit
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cca49ca0f8b34e72fd62533d32777465
https://doi.org/10.1002/piuz.200601107
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8
A note on the interpretation of seismic surface waves over three - dimensional structures
Autor: Erhard Wielandt, Stefanie Hunzinger, Wolfgang Friederich
Publikováno v: Geophysical Journal International. 143:335-339
In the 2-D acoustic case, the sound velocity of a heterogeneous medium can be determined from the amplitude and phase of almost any wavefield (but not from its phase alone) by inserting the wavefield into the Helmholtz equation and resolving for the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f6efdb0e2f9f3922c352c984d20bdb1d
https://doi.org/10.1046/j.1365-246x.2000.01241.x
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9
Interpretation of seismic surface waves in regional networks: joint estimation of wavefield geometry and local phase velocity. Method and numerical tests
Autor: Wolfgang Friederich, Erhard Wielandt
Publikováno v: Geophysical Journal International. 120:731-744
SUMMARY Teleseismic surface waves in general strongly deviate from plane waves as is evident from the analysis of surface-wave data recorded with dense networks. This causes conventional, ray-based tomographic techniques to break down if applied to n
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5b27eb26a38b043ec6e10a4587319f0a
https://doi.org/10.1111/j.1365-246x.1995.tb01849.x
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10
Propagation and Structural Interpretation of Non-Plane Waves
Autor: Erhard Wielandt
Publikováno v: Geophysical Journal International. 113:45-53
SUMMARY As a model for the 2-D horizontal propagation of seismic surface waves, we study the propagation of non-plane acoustic waves in homogeneous and inhomogeneous media. We find that their phase velocity depends not only on the medium but also on
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a9bb0494d9ff0121673c021d3e7a254f
https://doi.org/10.1111/j.1365-246x.1993.tb02527.x
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