Seasonal changes in shallow earth structure in the permafrost region of Alaska ...

• Main Authors: Tanimoto, Toshiro, Anderson, Aaron
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: permafrost; Alaska
• Online Access: https://dx.doi.org/10.57757/iugg23-0351; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016121

<!--!introduction!--> We analyzed data from the EarthScope Transportable Array in Alaska in order to understand the nature of near-surface melting in the permafrost region. Data consisted of (1) temperature, (2) vertical seismic data, (3) horizontal seismic data, and (4) wind data. Observations at some stations indicate a rapid melting phenomena in the summer that causes a thousandfold increase in horizontal power spectral density. This rapid rise in horizontal seismic noise typically occurs in July, lasting about 30 days. The initiation of this major melting period does not happen immediately after the surface temperature exceeds 0 o C; instead, there is a delay of about a month. After the peak horizontal amplitude is reached, it gradually returns to the pre-melting level. Many stations show that this return occurs by December. However, some stations require until March or April in the following year to arrive back to their pre-melting level. For all stations, this return occurs well after the surface ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...