scholarly journals Evidence for old carbon contamination in <sup>14</sup>C wiggle-match age series for the 946 CE eruption of Changbaishan volcano

2021 ◽  
Author(s):  
Richard N. Holdaway ◽  
Ben Kennedy ◽  
Brendan M Duffy ◽  
Jiandong Xu ◽  
Clive Oppenheimer
Keyword(s):  
Volcanic Eruptions ◽  
High Agreement ◽  
Carbon Contamination ◽  
Weak Association ◽  
Changbaishan Volcano ◽  
Millennium Eruption ◽  
Contamination Levels ◽  
Age Series ◽  
Age Estimates

Abstract. Volcanic eruptions that are not historically attested are commonly radiocarbon dated by "wiggle matching" sequential 14C measurements of the rings of trees killed by the eruption against an accepted calibration curve. It is generally assumed that carbon laid down in the wood is uncontaminated by 14C-free ("old") carbon, although evidence for contamination is well documented. Often, ill-fitting ring ages are excluded from analysis. The ‘Millennium Eruption' of Changbaishan volcano on the China-DPR Korea border offers a valuable case study in wiggle match dating, since several independent groups reported age estimates before the determination and acceptance of a precise eruption year of 946 CE. Some of the discrepancies and incompatibilities between published dates were attributed to old carbon effects. Here, we apply a new methodology to correct for contamination levels of up to 4.5% old carbon to eight wiggle match date series for the Millennium Eruption. Without discarding ring ages, we find agreement indices as high as, or higher than, those for the published dates, and five of the eight date series yielded high-agreement-index eruption dates closer to 946 CE than the published dates. None of the five yield a best result at zero contamination. Differences between the eruption dates reveal a weak association with the direction of the sampled tree from the caldera, but no relationship with distance. Our results suggest that old carbon contamination is possible over a wide area, potentially leading to over-estimation of eruption ages by years, decades or more, cautioning against over-reliance on wiggle-match ages that are not corroborated by other lines of evidence. Our revised protocol that accounts for contamination offers a way forward in the application of wiggle match dating of eruptions and provides a platform for understanding discrepancies that exist when comparing wiggle match series.

scholarly journals The fate of volcanic ash: premature or delayed sedimentation?

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Eduardo Rossi ◽  
Gholamhossein Bagheri ◽  
Frances Beckett ◽  
Costanza Bonadonna
Keyword(s):  
Residence Time ◽  
Volcanic Ash ◽  
Volcanic Eruptions ◽  
Theoretical Description ◽  
Particle Sedimentation ◽  
Weather Modeling ◽  
Explosive Volcanic Eruptions ◽  
Travel Distances ◽  
Ash Dispersal

AbstractA large amount of volcanic ash produced during explosive volcanic eruptions has been found to sediment as aggregates of various types that typically reduce the associated residence time in the atmosphere (i.e., premature sedimentation). Nonetheless, speculations exist in the literature that aggregation has the potential to also delay particle sedimentation (rafting effect) even though it has been considered unlikely so far. Here, we present the first theoretical description of rafting that demonstrates how delayed sedimentation may not only occur but is probably more common than previously thought. The fate of volcanic ash is here quantified for all kind of observed aggregates. As an application to the case study of the 2010 eruption of Eyjafjallajökull volcano (Iceland), we also show how rafting can theoretically increase the travel distances of particles between 138–710 μm. These findings have fundamental implications for hazard assessment of volcanic ash dispersal as well as for weather modeling.

scholarly journals Constructing Damage Indices Based on Publicly Available Spatial Data: Exemplified by Earthquakes and Volcanic Eruptions in Indonesia

2021 ◽  
Author(s):  
Emmanuel Skoufias ◽  
Eric Strobl ◽  
Thomas Tveit
Keyword(s):  
Spatial Data ◽  
Volcanic Ash ◽  
Satellite Images ◽  
Fragility Curves ◽  
Volcanic Eruptions ◽  
Damage Indices ◽  
Damage Indicator ◽  
Time Period ◽  
Peak Ground Motion

AbstractThis article demonstrates the construction of earthquake and volcano damage indices using publicly available remote sensing sources and data on the physical characteristics of events. For earthquakes we use peak ground motion maps in conjunction with building type fragility curves to construct a local damage indicator. For volcanoes we employ volcanic ash data as a proxy for local damages. Both indices are then spatially aggregated by taking local economic exposure into account by assessing nightlight intensity derived from satellite images. We demonstrate the use of these indices with a case study of Indonesia, a country frequently exposed to earthquakes and volcanic eruptions. The results show that the indices capture the areas with the highest damage, and we provide overviews of the modeled aggregated damage for all provinces and districts in Indonesia for the time period 2004 to 2014. The indices were constructed using a combination of software programs—ArcGIS/Python, Matlab, and Stata. We also outline what potential freeware alternatives exist. Finally, for each index we highlight the assumptions and limitations that a potential practitioner needs to be aware of.

scholarly journals Cooperation and tensions in multiethnic corporate societies using Teotihuacan, Central Mexico, as a case study

2015 ◽  
Vol 112 (30) ◽  
pp. 9210-9215 ◽  
Author(s):  
Linda R. Manzanilla
Keyword(s):  
Gulf Coast ◽  
Raw Materials ◽  
Volcanic Eruptions ◽  
Cotton Cloth ◽  
Central Mexico ◽  
Economic Power ◽  
Ruling Elite ◽  
Strong Ties ◽  
The Core

In this paper, I address the case of a corporate society in Central Mexico. After volcanic eruptions triggered population displacements in the southern Basin of Mexico during the first and fourth centuries A.D., Teotihuacan became a multiethnic settlement. Groups from different backgrounds settled primarily on the periphery of the metropolis; nevertheless, around the core, intermediate elites actively fostered the movement of sumptuary goods and the arrival of workers from diverse homelands for a range of specialized tasks. Some of these skilled craftsmen acquired status and perhaps economic power as a result of the dynamic competition among neighborhoods to display the most lavish sumptuary goods, as well as to manufacture specific symbols of identity that distinguished one neighborhood from another, such as elaborate garments and headdresses. Cotton attire worn by the Teotihuacan elite may have been one of the goods that granted economic importance to neighborhood centers such as Teopancazco, a compound that displayed strong ties to the Gulf Coast where cotton cloth was made. The ruling elite controlled raw materials that came from afar whereas the intermediate elite may have been more active in providing other sumptuary goods: pigments, cosmetics, slate, greenstone, travertine, and foreign pottery. The contrast between the corporate organization at the base and top of Teotihuacan society and the exclusionary organization of the neighborhoods headed by the highly competitive intermediate elite introduced tensions that set the stage for Teotihuacan’s collapse.

scholarly journals Socio-Cultural Dynamics of Resilience Building: Lesson Learned from Sleman, Indonesia

2019 ◽  
Vol 23 (1) ◽  
pp. 63
Author(s):  
Agusma Putri Wardani ◽  
Bevaola Kusumasari
Keyword(s):  
Community Dynamics ◽  
Public Awareness ◽  
Volcanic Eruptions ◽  
Policy Implications ◽  
Cultural Dynamics ◽  
Community Based Interventions ◽  
Cultural Changes ◽  
Study Results ◽  
Resilient Communities

The eruption of Mount Merapi in 2010 was one of the largest volcanic eruptions in Indonesian history. The catastrophic event resulted in fatalities, loss of homes and livelihoods, infrastructure damage, and trauma for residents. There also a shift in community dynamics. The purpose of this study is to analyse and understand the formation of resilient communities by examining the shift in the society dynamics, specifically socio-cultural changes in community-based interventions. The study is a case study of Pangukrejo Hamlet in Sleman, Indonesia. Study results showed that in the aftermath of the eruption, the community experienced changes in degree of harmony and mutual respect among members. The study identified community economy dynamics, which are attributable to three interventions. Study results formed the basis for drawing policy implications for public awareness of disaster risk and post-disaster recovery in general.

The adaptive capacity of New Zealand communities to wildfire

2012 ◽  
Vol 21 (6) ◽  
pp. 764 ◽  
Author(s):  
Pamela J. Jakes ◽  
E. R. (Lisa) Langer
Keyword(s):  
New Zealand ◽  
Natural Disasters ◽  
Adaptive Capacity ◽  
Local Knowledge ◽  
Expert Knowledge ◽  
Volcanic Eruptions ◽  
Institutional Capacity ◽  
Process Elements

When we think of natural disasters in New Zealand, we tend to think of earthquakes or volcanic eruptions. However, a series of events is placing New Zealand communities at greater risk of wildfire. In a case study of a rural New Zealand community that experienced wildfire, process elements such as networks and relationships among locals, development and application of local knowledge and experience, and access to and application of expert knowledge and institutional capacity helped build adaptive capacity for disasters.

A Tracking Analyst for large 3D spatiotemporal data from multiple sources (case study: Tracking volcanic eruptions in the atmosphere)

2018 ◽  
Vol 111 ◽  
pp. 283-293 ◽  
Author(s):  
Mohamed A. Gad ◽  
Mai H. Elshehaly ◽  
Denis Gračanin ◽  
Hicham G. Elmongui
Keyword(s):  
Volcanic Eruptions ◽  
Spatiotemporal Data ◽  
Multiple Sources

scholarly journals DIGITAL WORKFLOWS FOR RESTORATION AND MANAGEMENT OF THE MUSEUM AFFANDI - A CASE STUDY IN CHALLENGING CIRCUMSTANCES

2017 ◽  
Vol XLII-2/W5 ◽  
pp. 329-334 ◽  
Author(s):  
U. Herbig ◽  
G. Styhler-Aydın ◽  
D. Grandits ◽  
L. Stampfer ◽  
U. Pont ◽  
...  
Keyword(s):  
Volcanic Eruptions ◽  
Architectural Heritage ◽  
Indoor Climate ◽  
Combine Data ◽  
Collaborative Project ◽  
Existing Structures ◽  
Challenging Environment ◽  
Ongoing Development ◽  
Architectural Research

The appropriate restoration of architectural heritage needs a careful and comprehensive documentation of the existing structures, which even elaborates, if the function of the building needs special attention, like in museums.<br><br> In a collaborative project between the Universitas Gadjah Mada, Yogyakarta, Indonesia and two universities in Austria (TU Wien and the Danube University Krems) a restoration and adaptation concept of the Affandi Museum in Yogyakarta is currently in progress. It provides a perfect case study for the development of a workflow to combine data from a building survey, architectural research, indoor climate measurements and the documentation of artwork in a challenging environment, from hot and humid tropical climate to continuous threads by natural hazards like earthquakes or volcanic eruptions. The Affandi Museum houses the collection of Affandi, who is considered to be Indonesia's foremost Expressionist painter and partly designed and constructed the museum by himself. With the spirit of the artist still perceptible in the complex the Affandi Museum is an important part of the Indonesian cultural heritage. Thus its preservation takes special attention and adds to the complexity of the development of a monitoring and maintenance concept.<br><br> This paper describes the ongoing development of an approach to a workflow from the measurement and research of the objects, both architectural and artwork, to the semantically enriched BIM Model as the base for a sustainable monitoring tool for the Affandi Museum.

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