Santa Fe, New Mexico Get access PATRICK J. SMITH Search for other works by this author on: Oxford Academic Google Scholar The Musical Quarterly, Volume LV, Issue 1, January 1969, Pages 102–111, https://doi.org/10.1093/mq/LV.1.102 Published: 01 1969

Abstract Activity since 1995 at Soufrière Hills Volcano (SHV), Montserrat has alternated between andesite lava extrusion and quiescence, which are well correlated with seismicity ground deformation cycles. Large variations in SO 2 flux do not correlate these alternations, but high low HCl/SO characterize dome quiescent periods respectively. Since ceased (February 2010) steady emissions have continued an average rate of 374 tonnes/day (± 140 t/d), incandescent fumaroles (temperatures up to...

Additive manufacturing (AM) of carbon fibre reinforced thermoplastic composites can offer advantages over traditional through improved design freedom and reduction in production time cost. However, the produced using current state-of-the-art AM approaches generally possess high porosity (18–25 %) compared to those by conventional (1 %). An approach known as composite additive (CFAM) is presented, involving selectively printing a binder polymer powder onto discontinuous sheets, which are then...

Abstract Accurate modeling of rockfalls and pyroclastic flows is still an open issue, partly due to a lack measurements related their dynamics. Using seismic data from the Soufrière Hills Volcano, Montserrat, granular flow modeling, we show that power laws relating energy E s duration t loss potential Δ p f are very similar, like observed at Piton de la Fournaise, Reunion Island. Observations showing ≃ suggest constant ratio /Δ ≃10 −5 . This similarity in these two can be obtained only when...

Most people in Irish society, when asked, “Do we experience earthquakes Ireland?” would likely answer, “No don’t”. However, this is incorrect – do occur Ireland and are occasionally felt. This misconception understandable as not located near the edge of a plate boundary tend to be very low magnitude (M2.5 largest onshore earthquake recorded so far). As result, regular thought for population Ireland. We aim raise awareness on...

Seismic tremor plays a crucial role in eruption forecasting and is therefore monitored extensively on volcanoes around the world. However, use of volcanic for purposes requires improving our present understanding its source processes. This has proven challenging task. Traditionally, generation attributed to processes associated with magma transport or linked fluid-induced resonance (e.g. gases hydrothermal systems) within volcano plumbing system. In contrast, other studies suggest that...

Abstract On 11 February 2010, a partial dome collapse, the largest since 20 May 2006, occurred at Soufrière Hills Volcano (SHV), Montserrat. The collapse is also generated on northern flank of SHV eruption began in 1995. Approximately 50×10 6 m 3 was removed from dome, resulting widespread pyroclastic density currents (PDCs). Mapping revealed complex stratigraphy that varied widely across and NE flanks, reflected evolution collapse. deposits included range fine-grained ash-rich pumice-rich...

Ocean-bottom seismic (OBS) methods record both compressional (PP) and converted shear-wave (PS) data. PS data have successfully been used to image through gas-obscured zones (Li et al., 2001) reflectors that are weak on PP (MacLeod 1999), can also help constrain rock property estimates (Özdemir 2001). Thus, in principle, the use of significantly mitigate risk hydrocarbon exploration production. Unfortunately, imaging is not straightforward, due asymmetry raypaths (Figure 1). Accurate shear...

Abstract Vulcanian explosions generated at Soufrière Hills Volcano between 2008 and 2010 varied from simple events involving minimal pyroclastic density currents (PDCs) to complex more than one explosion. Calculated volumes for the deposits of PDCs formed by these ranged up 2.7×10 6 m 3 , with half having greater 1×10 . The in lithology, some generating pumice-rich (e.g. 29 July 11 February 2010) showing development sinuous lobes. These are similar those 1997, gas-rich, conduit-derived magma...

Abstract This paper describes ash-venting activity at Soufrière Hills Volcano, Montserrat that was precursory to the onset of three phases lava extrusion in 2005, 2008 and 2009, similar ash venting occurred during fifth phase extrusion. We describe detail a style mild, tephra-generating termed its associated tephra products. The nature seismicity with is compared explosive activity. All events, from small explosions large Vulcanian explosions, have impulsive, low-frequency onsets. These are...

The Oseberg field is located in the Norwegian North Sea blocks 30/6 and 30/9, approximately 140 km northwest of Bergen (Fig. 1). was discovered 1979, came onstream December 1988.

The Federal Aviation Administration (FAA) conducted limited operational flight trials of Trajectory Based Operations (TBO) based upon the use Required Time-of-Arrival (RTA) function in modern Flight Management Systems (FMSs) October 25-31, 2010. were on Olympia Six (OLM6) Standard Terminal Arrival (STAR) for Seattle-Tacoma International Airport by select Alaska Airlines pilots flying Boeing 737 Next Generation (B737NG) aircraft. concept was assignment Scheduled (STA) from Traffic Advisor...

Abstract We report on the first “real‐time” application of BET_UNREST (Bayesian Event Tree for Volcanic Unrest) probabilistic model, during a VUELCO Simulation Exercise carried out island Dominica, Lesser Antilles, in May 2015. Dominica has concentration nine potentially active volcanic centers and frequent earthquake swarms at shallow depths, intense geothermal activity, recent phreatic explosions (1997) indicate region is still active. The exercise scenario was developed secret by team...

This case study covers the first use of Q‐Marine dagger technology for both baseline and monitor surveys a 4D seismic project. In this paper we concentrate on steered‐streamer aspect system present results repeatability analyses acquisition data processing. The very high source receiver positions, fast turnaround difference cubes, deterministic processing sequences were all key issues A amplitude volume was produced board vessel within ten days end survey acoustic impedance cube generated...

Abstract The July 2008 vulcanian explosion at Soufrière Hills Volcano (SHV), Montserrat, was preceded by one of the largest seismic swarms observed since start eruption. We analyze spectral and waveform properties earthquakes in this swarm compare these observations to models subsurface volcanic processes. observe an initial volcano‐tectonic (VT) swarm, followed a large low‐frequency (LF) swarm. that content LF events changes over time carry more energy lower frequencies. This shift...

Håkon Haugvaldstad, Bjarne Lyngnes, Patrick Smith and Andrew Thompson describe the seismic acquisition processing techniques that have steadily enhanced quality reliability of time-lapse data on Ekofisk field, offshore Norway, anticipate further improvements in future.

The time-lapse seismic method compares repeated 3D reflection cubes acquired at different dates. Time-lapse binning is routinely used to ensure that these are created from recorded traces as similar possible, with poorly being discarded. Another important component of processing flows the conversion irregularly and differently sampled surveys into collocated measurements can be accurately compared. This regularization procedure usually performed independently binning, may well discard would...

Patrick Smith, Jason Thekkekara, Julie Branston, Grant Byerley, David Monk and Jeffrey Towart describe, with an example from the North Sea Forties field, how multi-measurement streamer technology enables reconstruction of a monitor survey to locations datum previous survey, thus improving time-lapse repeatability.

Ocean-bottom seismic (OBS) methods record both compressional (PP) and converted shear- wave (PS) data. PS data have successfully been used to image through gas clouds (Xiang-Yang Li et al., 2001) reflectors that are weak on PP ( MacLeod 1999), can help constrain rock property estimates (Özdemir 2001). Thus, in principle, the use of significantly mitigate risk hydrocarbon exploration production. However, imaging is reliant upon accurate shear velocity estimates, as moveout offset imaged point...

Volcanic tremor is a sustained seismic signal associated with volcanic unrest and often linked to movement of magmatic fluids in the subsurface. However, signals similar spectral content can be generated by other surface processes. Hence, one best ways distinguishing between different possible mechanisms tracking location its source, which also important for mitigating risk. Due emergent nature, cannot located using travel-time based methods, therefore alternatives such as amplitude-based...

Optimization of energy resources suggests increased fuel residence in reactor cores and hence improved fission product evaluations are required.For thermal reactors the cross sections JEF2.2 JEFF3.1 libraries plus new from WPEC23 assessed through modelling CERES experiment DIMPLE reactor.The analysis uses lattice code WIMS10.Cross for 12 nuclides assessed.The section low resonance data 147,152 Sm 155 Gd accurate to within 4%.Similar 109 Ag, 143 Nd 149 8% while 95 Mo, 99 Tc, 103 Rh, 133 Cs...