Криозизм
Криозизм , ледокол или замороз [ 1 ] [ 2 ] [ 3 ] [ 4 ] вызванное внезапным растрескивающим действием в замороженной почве или камнях, насыщенной водой Является ли сейсмическое событие , или льдом , [ 5 ] или стрессами, создаваемыми в замороженных озерах. [ 6 ] Когда вода сливается в землю, она может в конечном итоге заморозить и расширяться при более холодных температурах, оказав нагрузку на окружающую среду. Этот стресс нарастает до взрывоохранения в форме криозизма. [ 1 ] [ 7 ] Требования к возникновению криозизма многочисленны; [ 1 ] [ 2 ] Следовательно, точные прогнозы не являются полностью возможными и могут составлять фактор в структурном дизайне и технике при строительстве в области, исторически известной для таких событий. [ 5 ] Были сделаны спекуляции между глобальным потеплением и частотой криозизма. [ 8 ]
Эффекты
[ редактировать ]Криозиизмы часто принимают за незначительные внутрисброски землетрясения . [ 5 ] [ 9 ] Первоначальные показания могут показаться аналогичными показателями землетрясения с толчками , вибрациями, взломом земли и связанными с ним шумами, [ 4 ] такие как громовые или процветающие звуки. [ 7 ] Однако криозейзм можно отличить от землетрясений через метеорологические и геологические условия. [ 5 ] Криозиизмы могут иметь интенсивность до VI в модифицированной шкале Mercalli . [ 5 ] Кроме того, криозии часто демонстрируют высокую интенсивность в очень локализованной области, [ 4 ] в непосредственной близости от эпицентра , [ 9 ] по сравнению с широко распространенным воздействием землетрясения. [ 5 ] Из-за более низких частотных вибраций криозизма, [ 10 ] Некоторые станции сейсмического мониторинга могут не записывать их возникновение. [9] Cryoseisms release less energy than most tectonic events.[11] Since cryoseisms occur at the ground surface they can cause effects right at the site, enough to jar people awake.[4]
Some reports have indicated the presence of "distant flashing lights" before or during a cryoseism, possibly because of electrical changes when rocks are compressed.[7] Cracks and fissures may also appear as surface areas contract and split apart from the cold.[4][9] The sometime superficial to moderate occurrences may range from a few centimeters to several kilometers long, with either singular or multiple linear fracturing and vertical or lateral displacement possible.[5]
Occurrences
[edit]Glacial cryoseisms
[edit]A glacial cryoseism or glacial ice quake is a non-tectonic seismic event of the glacial cryosphere. A large variety of seismogenic glacial processes arising from internal, ocean calving, or basal processes have been identified and studied.[12][13] Very large calving events in Greenland and Antarctica have been observed to generate seismic events of magnitude 5 or larger.[14] Extremely large icebergs can also generate seismic signals that are observable at distances up to thousands of kilometers when they collide or grind across the ocean floor.[15] Basal glacial motion be enhanced due to water accumulation underneath a glacier sourced from surface or basal ice melt. Hydraulic pressure of subglacial water can reduce the friction at the bed, allowing the glacier to suddenly shift and generate seismic waves.[10][16] This type of cryoseism can be very brief, or may last for many minutes.[8]
Location
[edit]United States
[edit]
Geocryological processes were identified as a possible cause of tremors as early as 1818.[1][5] In the United States, such events have been reported throughout the Midwestern, Northern and Northeastern United States.[1][7][17]
Canada
[edit]Cryoseisms also occur in Canada,[1][2] especially along the Great Lakes/St. Lawrence corridor, where winter temperatures can shift very rapidly.[18][19] They have surfaced in Ontario, Quebec, Alberta and the Maritime Provinces.[18][20][21]
Other places
[edit]Glacier-related cryoseism phenomena have been reported in Alaska,[22] Greenland,[23] Iceland (Grímsvötn),[24] Finland,[25] Ross Island,[11] and the Antarctic Prince Charles Mountains.[26]
Precursors
[edit]There are four main precursors for a frost quake cryoseism event to occur:[1][2]
- A region must be susceptible to cold air masses
- The ground must undergo saturation from thaw or liquid precipitation prior to an intruding cold air mass
- Most frost quakes are associated with minor snow cover on the ground without a significant amount of snow to insulate the ground (i.e., less than 6 inches (15 cm))
- A rapid temperature drop from approximately freezing to near or below −18 °C (0 °F), which ordinarily occurred on a timescale of 16 to 48 hours.[1]
Cryoseisms typically occur when temperatures rapidly decrease from above freezing to subzero,[4][9] and are more than likely to occur between midnight and dawn (during the coldest parts of night).[1][5] However, due to the permanent nature of glacial ice, glacier-related cryoseisms may also occur in the warmer months of summer.[10] In general, cryoseisms may occur 3 to 4 hours after significant changes in temperature.[27] Perennial or seasonal frost conditions involved with cryoseisms limit these events to temperate climates that experience seasonal variation with subzero winters. Additionally, the ground must be saturated with water, which can be caused by snowmelt, rain, sleet or flooding.[5] Geologically, areas of permeable materials like sand or gravel, which are susceptible to frost action, are likelier candidates for cryoseisms.[5] Following large cryoseisms, little to no seismic activity will be detected for several hours, indicating that accumulated stress has been relieved.[27]
See also
[edit]References
[edit]- ^ Jump up to: a b c d e f g h i Battaglia, Steven M.; Changnon, David (2016-01-02). "Frost Quakes: Forecasting the Unanticipated Clatter". Weatherwise. 69 (1): 20–27. Bibcode:2016Weawi..69a..20B. doi:10.1080/00431672.2015.1109984. ISSN 0043-1672. S2CID 194149546.
- ^ Jump up to: a b c d Leung, Andrew C. W.; Gough, William A.; Shi, Yehong (2017), Leitner, Michael; Jokar Arsanjani, Jamal (eds.), "Identifying Frostquakes in Central Canada and Neighbouring Regions in the United States with Social Media", Citizen Empowered Mapping, vol. 18, Cham: Springer International Publishing, pp. 201–222, doi:10.1007/978-3-319-51629-5_9, ISBN 978-3-319-51628-8, retrieved 2024-01-19
- ^ "Milwaukee Area Frostquakes". University of Wisconsin–Milwaukee. 1994-02-24. Archived from the original on 2007-01-04. Retrieved 2006-10-22.
- ^ Jump up to: a b c d e f "Cryoseisms in Maine". Maine Geological Survey. 2005-10-06. Archived from the original on 2018-04-26. Retrieved 2006-10-21.
- ^ Jump up to: a b c d e f g h i j k Lacroix, Andrew V. (January 1980). "A Short Note on Cryoseisms". Seismological Research Letters. 51 (1): 15–21. Bibcode:1980SeiRL..51a..15L. doi:10.1785/gssrl.51.1.15. Archived from the original on 2007-01-04. Retrieved 2006-10-21.
- ^ Kavanaugh, Jeffrey; Schultz, Ryan; Andriashek, Laurence D.; van der Baan, Mirko; Ghofrani, Hadi; Atkinson, Gail; Utting, Daniel J. (2019). "A New Year's Day icebreaker: icequakes on lakes in Alberta, Canada". Canadian Journal of Earth Sciences. 56 (2): 183–200. Bibcode:2019CaJES..56..183K. doi:10.1139/cjes-2018-0196. hdl:1807/93572. ISSN 0008-4077.
- ^ Jump up to: a b c d Thurlow, Dave. "Cryoseisms Explained". The Weather Notebook. Mount Washington Observatory. Archived from the original on 2005-11-24. Retrieved 2006-10-21.
- ^ Jump up to: a b Irvine, Tom (June 2006). "Ice Quakes" (PDF). Vibrationdata Newsletter. Archived (PDF) from the original on 2018-05-04. Retrieved 2006-11-16.
- ^ Jump up to: a b c d e Ebel, John E.; Bedell, Richard; Urzua, Alfredo (July 1995). A Report on the Seismic Vulnerability of the State of Vermont (PDF) (Report). Vermont Emergency Management Agency. Archived (PDF) from the original on 2017-04-30. Retrieved 2006-10-22.
- ^ Jump up to: a b c Orem, William (2004-09-14). "Ice Quake!". A Moment of Science. Indiana University. Archived from the original on 2008-02-27. Retrieved 2006-11-16.
- ^ Jump up to: a b "Erebus Icequakes". Mount Erebus Volcano Observatory. Archived from the original on 2006-08-31. Retrieved 2006-11-16.
- ^ Podolskiy, Evgeny A.; Walter, Fabian (2016). "Cryoseismology". Reviews of Geophysics. 54 (4): 708–758. Bibcode:2016RvGeo..54..708P. doi:10.1002/2016RG000526. hdl:2115/64330. ISSN 8755-1209.
- ^ Aster, R C; Winberry, J P (2017-12-01). "Glacial seismology". Reports on Progress in Physics. 80 (12): 126801. Bibcode:2017RPPh...80l6801A. doi:10.1088/1361-6633/aa8473. ISSN 0034-4885. PMID 28782729.
- ^ Nettles, Meredith; Ekström, Göran (2010-04-01). "Glacial Earthquakes in Greenland and Antarctica". Annual Review of Earth and Planetary Sciences. 38 (1): 467–491. Bibcode:2010AREPS..38..467N. doi:10.1146/annurev-earth-040809-152414. ISSN 0084-6597.
- ^ Martin, Seelye; Drucker, Robert; Aster, Richard; Davey, Fred; Okal, Emile; Scambos, Ted; MacAyeal, Douglas (2010). "Kinematic and seismic analysis of giant tabular iceberg breakup at Cape Adare, Antarctica". Journal of Geophysical Research: Solid Earth. 115 (B6). Bibcode:2010JGRB..115.6311M. doi:10.1029/2009JB006700. ISSN 0148-0227.
- ^ Tognetti, Sylvia S. (2006-03-27). "Climate and economic models". The Post-Normal Times. Archived from the original on 2007-09-28. Retrieved 2006-11-16.
- ^ Tuohy, John (31 Jan 2019). "Ground-shaking frost quakes: They're Indiana's latest polar vortex phenomenon". Indianapolis Star.
- ^ Jump up to: a b "'Frost quakes' wake Toronto residents on cold night". CBC News. 2014-01-03. Archived from the original on 2017-02-15.
- ^ "Frequently Asked Questions about Earthquakes (FAQ)". Natural Resources Canada. Archived from the original on 2019-01-05.
- ^ Burke, Kenneth B. S. (May 2004). "Historical Seismicity in the Central Highlands, Passamaquoddy Bay, and Moncton Regions of New Brunswick, Canada, 1817–1961". Seismological Research Letters. 75 (3): 419–431. Bibcode:2004SeiRL..75..419B. doi:10.1785/gssrl.75.3.419.
- ^ Lawrence, Erin (2014-03-10). "Possible epicenter of frost quake found in northwest schoolyard". CTV News Calgary. Archived from the original on 2017-07-26.
- ^ "Alaska Glacier Tours – Know What To Look For". Alaska.org. Archived from the original on 2012-07-22. Retrieved 2006-11-16.
- ^ Гренландские ледники трещат по швам. Bigli Facts (in Russian). Bigli Web. Archived from the original on 2007-01-16. Retrieved 2006-10-22.
- ^ Gyula, Honyek (October 2003). "The Icelandic "Icy Flood"". ThinkQuest Library. Archived from the original on 2006-11-15. Retrieved 2006-11-16.
- ^ "New Data Helps Researchers Demystify 'Frost Quakes'". Inside Science. 11 November 2020. Retrieved 2022-10-20.
- ^ Johnston, Nicole (2002-11-29). "Surveying the Icy Peaks". Antarctic Summer. ABC News. Archived from the original on November 19, 2005. Retrieved 2006-11-16.
- ^ Jump up to: a b Willis, D. E.; Taylor, R. W.; LeNoble, M.; Yellin, S. (October 1979). "Icequake Precursors". 51st Annual Meeting of the Eastern Section of the Seismological Society of America. Dept of Geological Sciences, University of Wisconsin–Milwaukee. Archived from the original on 1999-09-21. Retrieved 2006-11-16.
External links
[edit]
Media related to Cryoseisms at Wikimedia Commons- Google Maps-based reporting website
