Study on the Prediction of the Shallow Failure-prone Sites by Using Digital Aerial Photos: on the Mt. Umyeon in Seoul City

2016 ◽  
Vol 16 (3) ◽  
pp. 151-160
Author(s):  
Kwang-Youn Lee ◽  
Kyoung-Nam Kim ◽  
Su-Jin Jang ◽  
Gi-Beom Seo ◽  
Beom-Soo Kim ◽  
...  
Keyword(s):  
Aerial Photos ◽  
Shallow Failure

Evoluzione della copertura vegetale in aree alpestri del Canton Ticino nel periodo 1971–2001 | Evolution of Vegetation Cover in the Alpine Regions of Canton Tessin: 1971–2001

2004 ◽  
Vol 155 (7) ◽  
pp. 284-289 ◽  
Author(s):  
Pietro Stanga ◽  
Niklaus Zbinden
Keyword(s):  
Initial Conditions ◽  
Ground Cover ◽  
Climatic Conditions ◽  
Human Pressure ◽  
Aerial Photos ◽  
Alpine Regions ◽  
Subsequent Decrease ◽  
Site Fertility ◽  
Strong Expansion ◽  
Evolution Of Vegetation

The retrospective study based on aerial photos (1971–2001) of the Canton Tessin made it possible to measure and analyze the evolution of the vegetation of eleven Alpine zones. The analysis shows a strong expansion of the arborescent vegetation and, at the same time, a decrease in other forms of ground cover (bush, shrub, meadow and unproductive spaces). Analysis of the data gives rise to the conjecture that the strong evolutionary dynamism evidenced by the areas under investigation is a result of the vast clearings carried out in past centuries to create pastures. Following the subsequent decrease in human pressure, nature today is attempting to rebalance the level of the biomass. These processes manifest themselves in different ways and with various intensity, depending on the interaction of numerous factors (e.g. climatic conditions, site fertility, initial conditions, evolution of anthropological pressure, etc.).

Aerial Photos Show Sangamon Paleosol in Nebraska

Soil Horizons ◽  
1968 ◽  
Vol 9 (1) ◽  
pp. 20
Author(s):  
James V. Drew
Keyword(s):  
Aerial Photos

scholarly journals Site Mapping from Aerial Photos

1961 ◽  
Vol 37 (4) ◽  
pp. 423-424
Author(s):  
D. M. Trew
Keyword(s):  
Aerial Photos ◽  
Site Mapping

Measurement of Reflectance Properties of Asphalt Surfaces and Their Usability as Reference Targets for Aerial Photos

2009 ◽  
Vol 47 (7) ◽  
pp. 2330-2339 ◽  
Author(s):  
E. Puttonen ◽  
J. Suomalainen ◽  
T. Hakala ◽  
J. Peltoniemi
Keyword(s):  
Aerial Photos

Investigation of the pre-eruptive processes of the 2014/15 Holuhraun eruption based on extracted volcanic tremor signals

2021 ◽  
Author(s):  
Zahra Zali ◽  
Eva Eibl ◽  
Matthias Ohrnberger ◽  
Frank Scherbaum
Keyword(s):  
Amplitude Ratio ◽  
Ground Deformation ◽  
Volcanic Tremor ◽  
Simultaneous Occurrence ◽  
Generation Process ◽  
Glacier Surface ◽  
Aerial Photos ◽  
Seismic Amplitude ◽  
Subglacial Eruptions ◽  
Eruption Precursors

<p>During volcanic unrest, multiple subsurface processes can happen simultaneously and may lead to an eruption. The analysis of seismic records in an unrest period before an eruption reveals information about the pre-eruptive processes and might be able to provide hints for a possible future eruption.</p><p>The 2014–2015 Holuhraun eruption was the largest one in Iceland in 230 years. It was extensively monitored and studied in a variety of multidisciplinary research approaches. Intense seismicity and ground deformation were interpreted as magma propagation from Bárðarbunga volcano 48 km laterally at ∼6 km depth over two weeks before an eruption started at Holuhraun. Different processes including vertical and lateral magma migration, dike propagation, caldera subsidence, and subglacial eruptions happened in this period and some models linking these processes are suggested. In the two-week interval preceding the eruption, there is still no clear connection between the observed tremor and pre-eruptive processes. Both the tremor source location and tremor generation process are not well understood yet. While cauldrons as a sign of subglacial eruptions were identified on the glacier surface from aerial photos, these cauldrons might have been formed earlier and there is hence an uncertainty of a few days. A tremor location might help to constrain these dates. However, the simultaneous occurrence of intense seismicity and tremor hinders the study and location of tremor. Here, we use a recent volcanic tremor extraction algorithm (Zali et al., 2020) and extract pre-eruptive tremor signals in order to better locate them using the Seismic Amplitude Ratio Analysis (SARA) method. Furthermore, the occurrence of the tremor could open new insights into ascending magma and fluid migration as well as the timing and duration of the subglacial eruptions.</p><p>We also observed short-lived tremors before the eruptions on August 29 and 31, which could be considered as eruption precursors. The primary investigation on the extracted tremor signals is promising while further analysis is on-going.</p>

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