Seismic Wave Interactions Between the Atmosphere - Ocean - Cryosphere System and the Geosphere in Polar Regions

Kanao, Masaki; Maggi, Alessia; Ishihara, Yoshiaki; Yamamoto, Masa‐yuki; Nawa, Kazunari; Yamada, Akira; Wilson, T. J.; Himeno, Tetsuto; Toyokuni, Genchi; Tsuboi, Seiji; Tono, Yoko; Anderson, Kent

doi:10.5772/23410

Cited by 19 publications

(27 citation statements)

References 26 publications

(20 reference statements)

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“…This is so because these events release energy at a much slower rate than tectonic earthquakes of comparable magnitude (see Ekström et al [2003] and Larmat et al [2008] for examples). Accordingly, cryospheric seismicity is interesting mainly as an insight into ice dynamics, as a proxy for climate change, or as a factor interfering with the interpretation of volcano-monitoring data [Métaxian, 2003] and local earthquake seismology [Kanao et al, 2012a].…”

Section: Seismic Portrait Of the Cryospherementioning

confidence: 99%

Cryoseismology

Podolskiy

Walter

2016

Reviews of Geophysics

212

209

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The last decade witnessed an explosion in yearly number of publications on passive glacier seismology. The seismic signals from a wide range of glacier‐related processes fill a broad band of frequencies (from 10−3 to 102 Hz) and moment magnitudes (from M–3 to M7) providing a fresh and unprecedented view on fundamental processes in the cryosphere. New insights into basal motion, iceberg calving, glacier, iceberg, and sea ice dynamics, and precursory signs of unstable glaciers and ice structural changes are being discovered with seismological techniques. These observations offer an invaluable foundation for understanding ongoing environmental changes and for future monitoring of ice bodies worldwide. In this review we discuss seismic sources in the cryosphere as well as research challenges for the near future. The field of glacier seismology is evolving so rapidly that some parts of this review will likely soon be outdated. Nevertheless, given an overwhelming number of recent publications and rapidly growing seismic data volumes provided by modern seismic installations in polar and mountain regions, this introduction to cryosphere seismicity aims to serve as a timely and comprehensive reference for glaciologists and seismologists.

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Section: Seismic Portrait Of the Cryospherementioning

confidence: 99%

Cryoseismology

Podolskiy

Walter

2016

Reviews of Geophysics

212

209

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“…In spite of the presence of large teleseismic signals towards the end of the day, the DFM is clearly visible with sufficient amplitude through the whole time period. Figure 5 represents similar PSDs for the whole year of 2004 over the period band 0.1-80 s (modified after Grob et al 2011;Kanao et al 2012). The DFM is in general more strongly excited when storms or blizzards visit the station, and to a large degree is probably generated in the vicinity of the Lützow-Holm Bay.…”

Section: Microseisms Recorded At Syowa Stationmentioning

confidence: 99%

“…Predominant frequencies corresponding to SFM and DFM are indicated by two arrows, respectively (modified afterGrob et al 2011;Kanao et al 2012).…”

mentioning

confidence: 99%

Characteristic atmosphere–ocean–solid earth interactions in the Antarctic coastal and marine environment inferred from seismic and infrasound recording at Syowa Station, East Antarctica

Kanao

Maggi

Ishihara

et al. 2013

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Several characteristic waves detected by seismographs in Antarctic stations have been recognized as originating from the physical interaction between the solid earth and the atmosphere -ocean-cryosphere system surrounding the Antarctic and may be used as a proxy for characterizing ocean wave climate. A Chaparral-type infrasound sensor was installed at Syowa Station (SYO; 39.6E, 69.0S), East Antarctica, in April 2008 during the International Polar Year (IPY2007-2008). Matching data are also available for this time period from the existing broadband seismic recorder located close by. Continuous infrasound data for 2008-2009 include background signals (microbaroms) with a broad peak in the wave period between the values of 4 and 10 s. Signals with the same period are recorded by the broadband seismograph at SYO (microseisms). This period band is identified as double-frequency microseisms/baroms (DFM). The DFM have relatively lower amplitudes during winter. We suggest that this is due to the sea-ice extent around the coast causing a decreased ocean loading effect. In contrast, the single frequency microseisms/baroms with a peak in period between 12 and 30 s are observed under storm conditions, particularly in winter. On the infrasound data, stationary signals are identified with harmonic overtones at a few Hertz to lowermost human audible band, which we suggest is due to local effects such as sea-ice cracking and vibration. Microseism measurements are a useful proxy for characterizing ocean wave climate, complementing other oceanographic and geophysical data.

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“…Sea-ice involved dynamics in offshore of LHB had also been excited the cryoseismic harmonic tremors. A large volume of fast sea-ice discharged in 1997 winter, and was clearly recorded by the seismographs at SYO [14] as a few tens of hour durating tremors with non-linear harmonic overtones.…”

Section: Introductionmentioning

confidence: 99%

Seismic Tremors and Their Relation to Cryosphere Dynamics in April 2015 around the Lützow-Holm Bay, East Antarctica

Kanao¹,

Murayama²,

Yamamoto³

et al. 2017

IJG

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Characteristics and statistics of seismic tremors occurring during April 2015 were investigated by using short-period and broadband seismographs deployed at Syowa Station (SYO), in the Lützow-Holm Bay (LHB), East Antarctica. In order to examine a relationship between surface environments in particular cryosphere variation, the MODIS satellite images were utilized for comparison with the detected tremor events. Since a large volume of sea-ice was discharged during the April, together with several large icebergs passed through from the west to the east at northern edge of the fast sea-ice of LHB, it was expected to detect seismic tremors involving cryospehre dynamics. During the month, a total number of 49 tremor events including short duration ice shocks were identified. Majority of the events (N = 39) had their duration times more than 15 minutes, which were divided into both tremors and ice shocks on the basis of experienced definition at SYO. Cryospheric sources recorded by seismic tremors were classified into several origins (collision, calving, crevassing, crashing, etc.): "crevassing events" along the large cracks inside the fast sea-ice in LHB (04 April), "discharge events" of fast sea-ice from the Bay (07 April), "collision events" between iceberg and the edge of fast sea-ice (14 April), "crashing movement" between fragmentation of fast sea-ice and packed sea-ice (18 April), and other origins. In particular, strong amplitude tremors with harmonic overtones were assumed to be occurred independently from whether condition, because these overtone tremors were identified at less stormy days by comparison with infrasound data at SYO.

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Seismic Wave Interactions Between the Atmosphere - Ocean - Cryosphere System and the Geosphere in Polar Regions

Cited by 19 publications

References 26 publications

Cryoseismology

Cryoseismology

Characteristic atmosphere–ocean–solid earth interactions in the Antarctic coastal and marine environment inferred from seismic and infrasound recording at Syowa Station, East Antarctica

Seismic Tremors and Their Relation to Cryosphere Dynamics in April 2015 around the Lützow-Holm Bay, East Antarctica

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Seismic Wave Interactions Between the Atmosphere - Ocean - Cryosphere System and the Geosphere in Polar Regions

Cited by 19 publications

References 26 publications

Cryoseismology

Cryoseismology

Characteristic atmosphere–ocean–solid earth interactions in the Antarctic coastal and marine environment inferred from seismic and infrasound recording at Syowa Station, East Antarctica

Seismic Tremors and Their Relation to Cryosphere Dynamics in April 2015 around the L&#252;tzow-Holm Bay, East Antarctica

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Seismic Tremors and Their Relation to Cryosphere Dynamics in April 2015 around the Lützow-Holm Bay, East Antarctica