Ergebnis 20 von 4315
Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...

Details

Autor(en) / Beteiligte
Titel
Results From a Decade of Optical Fiber Strainmeters at Piñon Flat Observatory
Ist Teil von
  • Earth and space science (Hoboken, N.J.), 2022-09, Vol.9 (9), p.n/a
Ort / Verlag
Hoboken: John Wiley & Sons, Inc
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Wiley-Blackwell Full Collection
Beschreibungen/Notizen
  • Optical fibers, stretched between anchors attached to the Earth and buried in boreholes and shallow trenches, offer an inexpensive and robust means to observe Earth strain. We have deployed several optical fiber strainmeters (OFSs) in boreholes, where thermal stability helps mitigate the noise from temperature changes. We have also constructed horizontal OFSs in 1‐m‐deep trenches of lengths 221 and 174 m. In these, a second optical fiber having a contrasting temperature coefficient provides a means to separate true strain from thermal noise. Signals in the seismic band from the horizontal strainmeters agree well with records from collocated seismometers, and the predominant ambient noise recorded by both techniques are consistent. Solid Earth strain tides with amplitude of 30 nε (nanostrain) are observed in these horizontal OFSs that agree well with those observed by collocated vacuum laser strainmeters. Noise at periods of a few days amounts to 50 nε. The two horizontal strainmeters show drift rates of up to 1 µε per month, and occasional false signals (evident from comparisons with the vacuum laser strainmeters) can accumulate occasionally to the order of 50 nε over times from hours to weeks. Results to date indicate that this technology on land could detect slow‐slip events of amplitude 100 nε and higher. Key Points Several styles of long‐baseline optical fiber strainmeters have been deployed The instruments are useful for the study of slow slip events, fluid injection, earth tides, and seismic signals, including for earthquake early warning
Sprache
Englisch
Identifikatoren
ISSN: 2333-5084
eISSN: 2333-5084
DOI: 10.1029/2022EA002381
Titel-ID: cdi_doaj_primary_oai_doaj_org_article_f996eb4d4b69442cb3cff3ae7b4b5272

Weiterführende Literatur

Empfehlungen zum selben Thema automatisch vorgeschlagen von bX