Structure and eruptive mechanisms at Surtsey Volcano, Iceland

1985 ◽  
Vol 122 (6) ◽  
pp. 649-661 ◽  
Author(s):  
James G. Moore
Keyword(s):  
Sea Level ◽  
Ground Surface ◽  
Drill Hole ◽  
Lava Flows ◽  
Drill Core ◽  
Top Down ◽  
Tuff Ring ◽  
The Core ◽  
Accretionary Lapilli ◽  
Continuous Activity

AbstractGlassy basalt tuff was the primary material cored in 1979 from a 181 m deep drill hole on the east tuff ring of Surtsey volcano. Despite the fact that the hole extends 122 m below sea level all the core is similar to the exposed tephra composing the two tuff rings of the island. The tuff includes abundant accretionary lapilli and tuff vesicles, indicating that it was all deposited subaerially. During the growth of the tuff rings, repeated hydromagmatic explosion cycles began with a series of intermittent tephra-finger explosions leading up to continuous uprush explosions which lasted for several minutes to several hours. This nozzle-like continuous activity produced eruption columns 100–250 m in diameter and 500–2000 m in height which probably quarried several hundred metres below the ground surface. The continuous-uprush explosion type provides a reasonable mechanism to excavate a diatreme from the top down. During construction of the tuff rings, concentric faults repeatedly downdropped a funnel-like structure (400–800 m in diameter) several hundred metres, thus accounting for the presence of subaerially deposited tephra in the drill core far beneath sea level. Ring dykes later intruded upward along these faults and fed small lava flows. Heat in the surface tephra probably originated primarily from these shallow intrusions.

Structural data from drill core

1994 ◽  
Vol 131 (5) ◽  
pp. 619-623
Author(s):  
Fernando Lopez-Diaz ◽  
Fernando Bastida
Keyword(s):  
Graphical Method ◽  
Structural Data ◽  
Drill Hole ◽  
Drill Core ◽  
Simple Computation ◽  
Structural Elements ◽  
Structural Element ◽  
The Core ◽  
Detailed Structural Analysis ◽  
Surface Geology

AbstractA graphical method for the analysis of the orientation of planar and linear structural elements in drill core is presented. Simple computation and projection operations applied to data taken from elements traced on the cylindrical surface of the core are required. To know a structural element(s) of reference, the method requires detailed structural analysis of the surface geology around the drill hole.

scholarly journals The future of SIMS: Who embodies which smile and when?

2010 ◽  
Vol 33 (6) ◽  
pp. 464-480 ◽  
Author(s):  
Paula M. Niedenthal ◽  
Martial Mermillod ◽  
Marcus Maringer ◽  
Ursula Hess
Keyword(s):  
Facial Expression ◽  
Eye Contact ◽  
Initial Position ◽  
Top Down ◽  
The Core ◽  
Facial Expression Of Emotion ◽  
Expression Of Emotion ◽  
Target Article ◽  
The Future

AbstractThe set of 30 stimulating commentaries on our target article helps to define the areas of our initial position that should be reiterated or else made clearer and, more importantly, the ways in which moderators of and extensions to the SIMS can be imagined. In our response, we divide the areas of discussion into (1) a clarification of our meaning of “functional,” (2) a consideration of our proposed categories of smiles, (3) a reminder about the role of top-down processes in the interpretation of smile meaning in SIMS, (4) an evaluation of the role of eye contact in the interpretation of facial expression of emotion, and (5) an assessment of the possible moderators of the core SIMS model. We end with an appreciation of the proposed extensions to the model, and note that the future of research on the problem of the smile appears to us to be assured.

scholarly journals Switching perception of musical meters by listening to different acoustic cues of biphasic sound stimulus.

2020 ◽  
Author(s):  
Sotaro Kondoh ◽  
Kazuo Okanoya ◽  
Ryosuke O Tachibana
Keyword(s):  
Music Perception ◽  
Sound Stimulus ◽  
Acoustic Cues ◽  
Point Scale ◽  
Top Down ◽  
Bottom Up ◽  
The Core ◽  
Entire Structure ◽  
Core Features

Meter is one of the core features of music perception. It is the cognitive grouping of regular sound sequences, typically for every 2, 3, or 4 beats. Previous studies have suggested that one can not only passively perceive the meter from acoustic cues such as loudness, pitch, and duration of sound elements, but also actively perceive it by paying attention to isochronous sound events without any acoustic cues. Studying the interaction of top-down and bottom-up processing in meter perception leads to understanding the cognitive system’s ability to perceive the entire structure of music. The present study aimed to demonstrate that meter perception requires the top-down process (which maintains and switches attention between cues) as well as the bottom-up process for discriminating acoustic cues. We created a “biphasic” sound stimulus, which consists of successive tone sequences designed to provide cues for both the triple and quadruple meters in different sound attributes, frequency, and duration, and measured how participants perceived meters from the stimulus in a five-point scale (ranged from “strongly triple” to “strongly quadruple”). Participants were asked to focus on differences in frequency and duration. We found that well-trained participants perceived different meters by switching their attention to specific cues, while untrained participants did not. This result provides evidence for the idea that meter perception involves the interaction between top-down and bottom-up processes, which training can facilitate.

scholarly journals Switching perception of musical meters by listening to different acoustic cues of biphasic sound stimulus

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256712
Author(s):  
Sotaro Kondoh ◽  
Kazuo Okanoya ◽  
Ryosuke O. Tachibana
Keyword(s):  
Music Perception ◽  
Sound Stimulus ◽  
Acoustic Cues ◽  
Point Scale ◽  
Top Down ◽  
Bottom Up ◽  
The Core ◽  
Entire Structure ◽  
Core Features

Meter is one of the core features of music perception. It is the cognitive grouping of regular sound sequences, typically for every 2, 3, or 4 beats. Previous studies have suggested that one can not only passively perceive the meter from acoustic cues such as loudness, pitch, and duration of sound elements, but also actively perceive it by paying attention to isochronous sound events without any acoustic cues. Studying the interaction of top-down and bottom-up processing in meter perception leads to understanding the cognitive system’s ability to perceive the entire structure of music. The present study aimed to demonstrate that meter perception requires the top-down process (which maintains and switches attention between cues) as well as the bottom-up process for discriminating acoustic cues. We created a “biphasic” sound stimulus, which consists of successive tone sequences designed to provide cues for both the triple and quadruple meters in different sound attributes, frequency, and duration. Participants were asked to focus on either frequency or duration of the stimulus, and to answer how they perceived meters on a five-point scale (ranged from “strongly triple” to “strongly quadruple”). As a result, we found that participants perceived different meters by switching their attention to specific cues. This result adds evidence to the idea that meter perception involves the interaction between top-down and bottom-up processes.

scholarly journals Long-term challenge to mangrove in the National park Xuanthuy – data released from shallow subsidence monitoring

2018 ◽  
Vol 34 (3) ◽  
Author(s):  
Le Xuan Thuyen
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
National Park ◽  
Low Cost ◽  
River Mouth ◽  
Biosphere Reserve ◽  
The United States ◽  
Red River ◽  
United States Geological Survey ◽  
The Core

A small mangrove colony growing for several decades on a mud flat on the left side of Balat River mouth has become today a large and healthy forest, containing a high ecosystem service value in the core of the Red River biosphere reserve. As a pioneer ecosystem located at land– water interface in the tropic, there exist always risks to mangroves, especially due to climate change and sea level rise. Sea level rise is a worldwide process, but subsidence is a local problem that can exacerbate these geo-hazards. A monitoring of shallow subsidence has been carried out by using SET-MH technique (developed by the United States Geological Survey) to track the both accretion and land sinking in the core zone of the National Park. The measurement shows the average sedimentation rate of 2.9 cm / yr and the sinking rate of 3.4 cm / yr, since Dec. 30th 2012. This is the first ground-based observation of shallow subsidence under mangroves in the Tonkin Gulf. As a simple and low cost method, so further expansion of this monitoring could provide more useful information to help identify the generally sinking trend of coastal areas in the Red River Delta and also to protect its own biosphere reserve.

The geochemical stratigraphy, field relations and temporal variation of the Mull–Morvern Tertiary lava succession, NW Scotland

1995 ◽  
Vol 86 (1) ◽  
pp. 35-47 ◽  
Author(s):  
Andrew Craig Kerr
Keyword(s):  
Sea Level ◽  
Main Part ◽  
Volcanic Ash ◽  
Lava Flows ◽  
Field Observations ◽  
Continuous Section ◽  
Flow Units ◽  
Early Tertiary ◽  
The Uk ◽  
Basaltic Lavas

AbstractThe early Tertiary Mull-Morvern lava succession, NW Scotland, represents the thickest continuous section (1000 m from sea level to the top of Ben More) of Tertiary lavas exposed in the UK. This succession has been sampled and geochemically analysed, on a flow-by-flow basis, throughout the lava succession. Field observations during the course of this sampling suggest that the early lava flows (the Staffa Magma sub-Type) ponded in palaeovalleys along with interlava sediments. In the main part of the Mull lava succession (the Mull Plateau Group) the lava flows are on average ∼ 5 m thick. Most previous Hebridean workers have assumed that the red horizons commonly found between these later lava flows, represent weathered flow tops. However, this study has shown that in some places these red ‘boles’ appear to be a combination of both volcanic ash and weathered basalt.Chemically distinctive units of flows have been found throughout the succession. The two most abundant magma sub-types of the Mull Plateau Group, primitive (>9wt% MgO) basalts with Ba/Nb» 15 and more evolved (<9wt% MgO) basalts-hawaiites with Ba/Nb<15, form packets of flow units which can be up to 200 m thick. These chemically distinctive flow units have been correlated across the lava succession. However, the correlation of individual lava flows has proved difficult. The Mull Plateau Group lavas generally become more evolved and less contaminated with continental crust towards the top of the succession, culminating in the trachytes of the Pale Group on Ben More. Basaltic lavas above the Pale Group have markedly different trace element ratios, and seem to represent shallower, more extensive asthenospheric melting than the Mull Plateau Group.

The Structure of Cosmic Ray Air Showers

1949 ◽  
Vol 2 (2) ◽  
pp. 184
Author(s):  
CBO Mohr
Keyword(s):  
High Pressure ◽  
Sea Level ◽  
Cosmic Ray ◽  
Low Density ◽  
Air Showers ◽  
Ionization Chambers ◽  
Single Chamber ◽  
Transition Effect ◽  
The Core ◽  
Rate Frequency

The structure of cosmic ray air showers at sea-level has been studied by an investigation of the burst rate frequency and the transition effect in lead, for cosmic ray bursts occurring simultaneously in two high-pressure ionization chambers with varying separation. Although extensive showers were responsible for all the coincidences observed with the larger chamber separations, they accounted for less than 3 per cent, of the bursts observed with a single chamber. Of the remaining 97 per cent., somewhat more than one-half appear to be due to nuclear disintegrations and the rest either to narrow showers of approximate radius 30 cm. or to the core of an extensive shower of low density. The extensive shower frequency was about 10 times that predicted by theory. The bearing of these results on present views of the origin and development of air showers is discussed.

scholarly journals ‘The Very Foundations of Any System of Criminal Justice’: Criminal Responsibility in the Australian Model Criminal Code

2017 ◽  
Vol 6 (3) ◽  
pp. 8-24 ◽  
Author(s):  
Arlie Loughnan
Keyword(s):  
Criminal Justice ◽  
Criminal Law ◽  
Criminal Responsibility ◽  
Criminal Code ◽  
Law Reform ◽  
Reform Process ◽  
Conceptual Level ◽  
Top Down ◽  
The Core ◽  
Reform Project

The Model Criminal Code (MCC) was intended to be a Code for all Australian jurisdictions. It represents a high point of faith in the value and possibility of systematising, rationalising and modernising criminal law. The core of the MCC is Chapter 2, the ‘general principles of criminal responsibility’, which outlines the ‘physical’ and ‘fault’ elements of criminal offences, and defines concepts such as recklessness. This paper assesses the MCC as a criminal law reform project and explores questions of how the MCC came into being, and why it took shape in certain ways at a particular point in time. The paper tackles these questions from two different perspectives—‘external’ and ‘internal’ (looking at the MCC from the ‘outside’ and the ‘inside’). I make two main arguments. First, I argue that, driven by a ‘top down’ law reform process, the MCC came into being at a time when changes in crime and criminal justice were occurring, and that it may be understood as an attempt to achieve stability in a time of change. Second, I argue that the significance of the principles of criminal responsibility, which formed the central pivot of the MCC, lies on the conceptual level—in relation to the language through which the criminal law is thought about, organised and reformed.

Local Infrastructures for Peace

2021 ◽  
pp. 626-640
Author(s):  
Andries Odendaal
Keyword(s):  
Top Down ◽  
Bottom Up ◽  
Local Agency ◽  
The Core ◽  
Past Experiences ◽  
The Way

The way “the local” had been interpreted led to contrasting top-down or bottom-up understandings of local infrastructures for peace. This chapter presents a reinterpretation of the relevance of infrastructures for peace from a practitioner’s perspective, considering past experiences and current theoretical debates. It argues for an appreciation of the complex, interlinked nature of global, national, and local conflicts and the necessity of flexible yet sustained and productive dialogue platforms at the points of frictional interactions at and between all these levels. The capacity to initiate and support such dialogue platforms where, crucially, local agency is respected is at the core of the approach that became known as “infrastructures for peace.”

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