Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains
We conducted a 9-d seismic experiment in October 2015 at Laohugou Glacier No. 12. We identified microseismic signals using the short-term/long-term average trigger algorithm at four stations and classified them as long and short-duration events based on waveform, frequency, duration and magnitude ch...
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ftdoajarticles:oai:doaj.org/article:56d857f354904ba4957401bb7103bb4c 2023-05-15T13:29:34+02:00 Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains Tao Zhang Yuqiao Chen Min Ding Zhongyan Shen Yuande Yang Qingsheng Guan 2019-09-01T00:00:00Z https://doi.org/10.1017/aog.2018.34 https://doaj.org/article/56d857f354904ba4957401bb7103bb4c EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305518000344/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2018.34 0260-3055 1727-5644 https://doaj.org/article/56d857f354904ba4957401bb7103bb4c Annals of Glaciology, Vol 60, Pp 125-136 (2019) cracks glacier geophysics mountain glaciers seismicity Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/aog.2018.34 2023-03-12T01:31:55Z We conducted a 9-d seismic experiment in October 2015 at Laohugou Glacier No. 12. We identified microseismic signals using the short-term/long-term average trigger algorithm at four stations and classified them as long and short-duration events based on waveform, frequency, duration and magnitude characteristics. Both categories show systematical diurnal trends. The long-duration events are low-frequency tremor-like events that mainly occurred during the daytime with only several events per day. These events lasted tens of seconds to tens of minutes and are likely related to resonance of daytime meltwater. The dominant short-duration events mostly occurred during the night time with a peak occurrence frequency of ~360 h−1. Their short-duration (<0.2 s), high frequency (20–100 Hz) and dominance of Rayleigh waves are typical of events for near-surface crack opening. A strong negative correlation between the hourly event number and temperature change rate suggests that the occurrence of night-time events is controlled by the rate of night-time cooling. We estimated the near-surface tensile stress due to thermal contraction at night to be tens of kilopascals, which is enough to induce opening of surface cracks with pre-existing local stress concentrations, although we cannot exclude the effect of refreezing of meltwater produced during the day. Article in Journal/Newspaper Annals of Glaciology Directory of Open Access Journals: DOAJ Articles Annals of Glaciology 60 79 125 136 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
cracks glacier geophysics mountain glaciers seismicity Meteorology. Climatology QC851-999 |
spellingShingle |
cracks glacier geophysics mountain glaciers seismicity Meteorology. Climatology QC851-999 Tao Zhang Yuqiao Chen Min Ding Zhongyan Shen Yuande Yang Qingsheng Guan Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains |
topic_facet |
cracks glacier geophysics mountain glaciers seismicity Meteorology. Climatology QC851-999 |
description |
We conducted a 9-d seismic experiment in October 2015 at Laohugou Glacier No. 12. We identified microseismic signals using the short-term/long-term average trigger algorithm at four stations and classified them as long and short-duration events based on waveform, frequency, duration and magnitude characteristics. Both categories show systematical diurnal trends. The long-duration events are low-frequency tremor-like events that mainly occurred during the daytime with only several events per day. These events lasted tens of seconds to tens of minutes and are likely related to resonance of daytime meltwater. The dominant short-duration events mostly occurred during the night time with a peak occurrence frequency of ~360 h−1. Their short-duration (<0.2 s), high frequency (20–100 Hz) and dominance of Rayleigh waves are typical of events for near-surface crack opening. A strong negative correlation between the hourly event number and temperature change rate suggests that the occurrence of night-time events is controlled by the rate of night-time cooling. We estimated the near-surface tensile stress due to thermal contraction at night to be tens of kilopascals, which is enough to induce opening of surface cracks with pre-existing local stress concentrations, although we cannot exclude the effect of refreezing of meltwater produced during the day. |
format |
Article in Journal/Newspaper |
author |
Tao Zhang Yuqiao Chen Min Ding Zhongyan Shen Yuande Yang Qingsheng Guan |
author_facet |
Tao Zhang Yuqiao Chen Min Ding Zhongyan Shen Yuande Yang Qingsheng Guan |
author_sort |
Tao Zhang |
title |
Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains |
title_short |
Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains |
title_full |
Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains |
title_fullStr |
Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains |
title_full_unstemmed |
Air-temperature control on diurnal variations in microseismicity at Laohugou Glacier No. 12, Qilian Mountains |
title_sort |
air-temperature control on diurnal variations in microseismicity at laohugou glacier no. 12, qilian mountains |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/aog.2018.34 https://doaj.org/article/56d857f354904ba4957401bb7103bb4c |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
Annals of Glaciology, Vol 60, Pp 125-136 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305518000344/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2018.34 0260-3055 1727-5644 https://doaj.org/article/56d857f354904ba4957401bb7103bb4c |
op_doi |
https://doi.org/10.1017/aog.2018.34 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
125 |
op_container_end_page |
136 |
_version_ |
1766001310220419072 |