List of works - Michael J. Heap

A general model for welding of ash particles in volcanic systems validated using in situ X-ray tomography

scholarly article

A generic model for the shallow velocity structure of volcanoes

scholarly article by Philippe Lesage et al published May 2018 in Journal of Volcanology and Geothermal Research

A model for permeability evolution during volcanic welding

scientific article published in January 2021

A multidisciplinary approach to quantify the permeability of the Whakaari/White Island volcanic hydrothermal system (Taupo Volcanic Zone, New Zealand)

article

A proxy for magmatic foams: FOAMGLAS®, a closed-cell glass insulation

scientific article published in March 2019

A reappraisal of explosive–effusive silicic eruption dynamics: syn-eruptive assembly of lava from the products of cryptic fragmentation

scholarly article

A universal model for the permeability of sintered materials

scientific article published in May 2023

Acid-Induced Dissolution of Andesite: Evolution of Permeability and Strength

scientific article

Assessing the role of fractures on the permeability of the Permo-Triassic sandstones at the Soultz-sous-Forêts (France) geothermal site

article

Brittle creep in basalt and its application to time-dependent volcano deformation

scholarly article by M.J. Heap et al published July 2011 in Earth and Planetary Science Letters

Challenges for forecasting based on accelerating rates of earthquakes at volcanoes and laboratory analogues

scholarly article by Andrew F. Bell et al published 1 May 2011 in Geophysical Journal International

Characterizing the physical properties of rocks from the Paleozoic to Permo-Triassic transition in the Upper Rhine Graben

article by Alexandra R. L. Kushnir et al published 23 August 2018 in Geothermal Energy

Closing an open system: Pore pressure changes in permeable edifice rock at high strain rates

scholarly article by Michael J. Heap & Fabian B. Wadsworth published April 2016 in Journal of Volcanology and Geothermal Research

Coda wave interferometry during the heating of deep geothermal reservoir rocks

scientific article

Conditions and timescales for welding block-and-ash flow deposits

scholarly article by M.J. Heap et al published December 2014 in Journal of Volcanology and Geothermal Research

Conduit processes in crystal-rich dacitic magma and implications for eruptive cycles at Guagua Pichincha volcano, Ecuador

scientific article published on 16 November 2022

Conservation and restoration of St. George's church (Nördlingen, Germany), a 15th century Gothic church built using suevite from the Ries impact crater

scientific article published on 27 July 2019

Cyclic shear zone cataclasis and sintering during lava dome extrusion: Insights from Chaos Crags, Lassen Volcanic Center (USA)

scientific article published in September 2020

Decarbonation and thermal microcracking under magmatic P-T-f CO2 conditions: the role of skarn substrata in promoting volcanic instability

scholarly article by S. Mollo et al published 31 July 2013 in Geophysical Journal International

Determination of permeability using a classic Darcy water column

scientific article published in January 2020

Does an inter-flaw length control the accuracy of rupture forecasting in geological materials?

scholarly article by Jérémie Vasseur et al published October 2017 in Earth and Planetary Science Letters

Elastic moduli evolution and accompanying stress changes with increasing crack damage: implications for stress changes around fault zones and volcanoes during deformation

article published in 2010

Estimating in situ rock mass strength and elastic modulus of granite from the Soultz-sous-Forêts geothermal reservoir (France)

article

Evidence for the development of permeability anisotropy in lava domes and volcanic conduits

article

Experimental constraints on phreatic eruption processes at Whakaari (White Island volcano)

scholarly article by Klaus Mayer et al published September 2015 in Journal of Volcanology and Geothermal Research

Experimental generation of volcanic pseudotachylytes: Constraining rheology

Experimental investigation of the mechanical properties of synthetic magnesium sulfate hydrates: Implications for the strength of hydrated deposits on Mars

scholarly article

Exploring the scale-dependent permeability of fractured andesite

scholarly article by Michael J. Heap & Ben M. Kennedy published August 2016 in Earth and Planetary Science Letters

Fire resistance of the Mt. Epomeo Green Tuff, a widely-used building stone on Ischia Island (Italy)

article

Flank instability assessment at Kick-’em-Jenny submarine volcano (Grenada, Lesser Antilles): a multidisciplinary approach using experiments and modeling

Forecasting volcanic eruptions and other material failure phenomena: An evaluation of the failure forecast method

scholarly article

Fracture and compaction of andesite in a volcanic edifice.

scientific article

Fracture of magma containing overpressurised pores

scholarly article by Michael J. Heap et al published August 2015 in Journal of Volcanology and Geothermal Research

Friendly fire: Engineering a fort wall in the Iron Age

From permanent flank sliding to catastrophic collapse and explosive eruptions at basaltic volcanoes: the role of shallow intrusive magma bodies

scientific article published on 3 March 2021

From rock to magma and back again: The evolution of temperature and deformation mechanism in conduit margin zones

scholarly article

Hot climate inhibits volcanism on Venus: Constraints from rock deformation experiments and argon isotope geochemistry

scholarly article by Sami Mikhail & Michael J. Heap published July 2017 in Physics of the Earth and Planetary Interiors

Hot pressing in conduit faults during lava dome extrusion: Insights from Mount St. Helens 2004–2008

scholarly article by Amy G. Ryan et al published January 2018 in Earth and Planetary Science Letters

How tough is tuff in the event of fire?

scholarly article

Hydrothermal alteration can result in pore pressurization and volcano instability

scientific article

Hydrothermal alteration of andesitic lava domes can lead to explosive volcanic behaviour

scientific article published on 07 November 2019

Impact of stylolites on the mechanical strength of limestone

scientific article published in October 2016

Increase in radon emission due to rock failure: An experimental study

scholarly article by S. Mollo et al published July 2011 in Geophysical Research Letters

Inelastic Compaction in High-Porosity Limestone Monitored Using Acoustic Emissions

scientific article

Inelastic compaction and permeability evolution in volcanic rock

scholarly article by Jamie I. Farquharson et al published 27 April 2017 in Solid Earth

Influence of temperature on brittle creep in sandstones

scholarly article

Laboratory simulations of tensile fracture development in a volcanic conduit via cyclic magma pressurisation

article

Large-scale lava dome fracturing as a result of concealed weakened zones

scientific article published on 5 September 2022

Local geology controlled the feasibility of vitrifying Iron Age buildings

scientific article

Low surface gravitational acceleration of Mars results in a thick and weak lithosphere: Implications for topography, volcanism, and hydrology

scholarly article by Michael J. Heap et al published January 2017 in Icarus

Mechanical behaviour and failure modes in the Whakaari (White Island volcano) hydrothermal system, New Zealand

article

Mechanical behaviour of dacite from Mount St. Helens (USA): A link between porosity and lava dome extrusion mechanism (dome or spine)?

scholarly article by M.J. Heap et al published December 2016 in Journal of Volcanology and Geothermal Research

Mechanical behaviour of the Rotokawa Andesites (New Zealand): Insight into permeability evolution and stress-induced behaviour in an actively utilised geothermal reservoir

article

Mechanics of Time-Dependent Deformation in Crustal Rocks

scholarly article published 18 June 2013

Mechanisms of time-dependent deformation in porous limestone

scholarly article

Micromechanics of brittle creep in rocks

scholarly article

Microstructural and petrophysical properties of the Permo-Triassic sandstones (Buntsandstein) from the Soultz-sous-Forêts geothermal site (France)

article

Microstructural controls on the physical and mechanical properties of edifice-forming andesites at Volcán de Colima, Mexico

scholarly article

Modelling the time-dependent rheological behaviour of heterogeneous brittle rocks

article by Tao Xu et al published 23 April 2012 in Geophysical Journal International

Numerical Approach to Creep of Rock Based on the Numerical Manifold Method

Permeability and porosity relationships of edifice-forming andesites: A combined field and laboratory study

scholarly article by Jamie Farquharson et al published May 2015 in Journal of Volcanology and Geothermal Research

Permeability of volcanic rocks to gas and water

scholarly article by M.J. Heap et al published April 2018 in Journal of Volcanology and Geothermal Research

Petrophysical properties, mechanical behaviour, and failure modes of impact melt-bearing breccia (suevite) from the Ries impact crater (Germany)

scientific article published in October 2020

Physical and mechanical property relationships of a shallow intrusion and volcanic host rock, Pinnacle Ridge, Mt. Ruapehu, New Zealand

scholarly article by S.P. Mordensky et al published June 2018 in Journal of Volcanology and Geothermal Research

Physical property relationships of the Rotokawa Andesite, a significant geothermal reservoir rock in the Taupo Volcanic Zone, New Zealand

article

Pore pressure embrittlement in a volcanic edifice

Porosity evolution at the brittle-ductile transition in the continental crust: Implications for deep hydro-geothermal circulation

scientific article published on 09 August 2017

Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand

scientific article

Quantifying the role of hydrothermal alteration in creating geothermal and epithermal mineral resources: The Ohakuri ignimbrite (Taupō Volcanic Zone, New Zealand)

scholarly article

Rapid solid-state sintering in volcanic systems

scientific article published in December 2018

Rate- and strain-dependent brittle deformation of rocks

scholarly article

Reconstructing magma failure and the degassing network of dome-building eruptions

scholarly article

Slip on 'weak' faults by the rotation of regional stress in the fracture damage zone

scientific article published in Nature

Strain-induced permeability increase in volcanic rock

scholarly article

Strain‐Dependent Rheology of Silicate Melt Foams: Importance for Outgassing of Silicic Lavas

scientific article

Strength and permeability recovery of tuffisite-bearing andesite

scholarly article by Stephan Kolzenburg et al published 12 July 2012 in Solid Earth

Stylolites in limestones: Barriers to fluid flow?

scientific article

The Brittle-Ductile Transition in Porous Limestone Imaged by X-Ray Computed Tomography and Digital Image Correlation

scholarly article published 6 July 2017

The Brittle‐Ductile Transition in Porous Limestone: Failure Mode, Constitutive Modeling of Inelastic Deformation and Strain Localization

scientific article published in 2021

The Influence of Temperature on Time-Dependent Deformation and Failure in Granite: A Mesoscale Modeling Approach

The Influence of Water Saturation on the Short- and Long-Term Mechanical Behavior of Red Sandstone

The Modeling of Time-Dependent Deformation and Fracturing of Brittle Rocks Under Varying Confining and Pore Pressures

article by Tao Xu et al published 3 May 2018 in Rock Mechanics and Rock Engineering

The Permeability Evolution of Tuffisites and Implications for Outgassing Through Dense Rhyolitic Magma

scientific article

The evolution of elastic moduli with increasing crack damage during cyclic stressing of a basalt from Mt. Etna volcano

The force required to operate the plunger on a French press

scientific article published in August 2021

The influence of porosity and vesicle size on the brittle strength of volcanic rocks and magma

article by Michael J. Heap et al published 30 August 2014 in Bulletin of Volcanology

The influence of thermal-stressing (up to 1000°C) on the physical, mechanical, and chemical properties of siliceous-aggregate, high-strength concrete

The influence of water on the strength of Neapolitan Yellow Tuff, the most widely used building stone in Naples (Italy)

article

The permeability and elastic moduli of tuff from Campi Flegrei, Italy: implications for ground deformation modelling

article

The permeability of stylolite-bearing limestone

The strength and permeability of tuffisite-bearing andesite in volcanic conduits

scientific article published on 7 March 2012

The strength of heterogeneous volcanic rocks: A 2D approximation

scholarly article by Michael J. Heap et al published June 2016 in Journal of Volcanology and Geothermal Research

The thermal properties of porous andesite

scientific article published in June 2020

Thermal weakening of the carbonate basement under Mt. Etna volcano (Italy): Implications for volcano instability

article

Time Dependent Compaction and Strain Localisation in Porous Sandstone - Implications for Reservoir Compaction

Time-dependent brittle creep in Darley Dale sandstone

scientific article

Time-dependent compaction band formation in sandstone

Time-dependent cracking and brittle creep in crustal rocks: A review

article

Time-dependent permeability evolution in compacting volcanic fracture systems and implications for gas overpressure

scholarly article by Jamie I. Farquharson et al published June 2017 in Journal of Volcanology and Geothermal Research

Timescales for permeability reduction and strength recovery in densifying magma

scholarly article by M.J. Heap et al published November 2015 in Earth and Planetary Science Letters

Timescales of porosity and permeability loss by solid-state sintering

scientific article published in November 2020

Tracking the permeable porous network during strain-dependent magmatic flow

scholarly article by J.E. Kendrick et al published June 2013 in Journal of Volcanology and Geothermal Research

Variability in composition and physical properties of the sedimentary basement of Mt Etna, Italy

article

Volcanic conduit failure as a trigger to magma fragmentation

Volcanic edifice weakening via decarbonation: A self-limiting process?

article by Silvio Mollo et al published 10 August 2012 in Geophysical Research Letters

Volcanic edifice weakening via devolatilization reactions

scholarly article by Silvio Mollo et al published 1 September 2011 in Geophysical Journal International

List of works by Michael J. Heap

A general model for welding of ash particles in volcanic systems validated using in situ X-ray tomography

A generic model for the shallow velocity structure of volcanoes

A model for permeability evolution during volcanic welding

A multidisciplinary approach to quantify the permeability of the Whakaari/White Island volcanic hydrothermal system (Taupo Volcanic Zone, New Zealand)

A proxy for magmatic foams: FOAMGLAS®, a closed-cell glass insulation

A reappraisal of explosive–effusive silicic eruption dynamics: syn-eruptive assembly of lava from the products of cryptic fragmentation

A universal model for the permeability of sintered materials

Acid-Induced Dissolution of Andesite: Evolution of Permeability and Strength

Assessing the role of fractures on the permeability of the Permo-Triassic sandstones at the Soultz-sous-Forêts (France) geothermal site

Brittle creep in basalt and its application to time-dependent volcano deformation

Challenges for forecasting based on accelerating rates of earthquakes at volcanoes and laboratory analogues

Characterizing the physical properties of rocks from the Paleozoic to Permo-Triassic transition in the Upper Rhine Graben

Closing an open system: Pore pressure changes in permeable edifice rock at high strain rates

Coda wave interferometry during the heating of deep geothermal reservoir rocks

Conditions and timescales for welding block-and-ash flow deposits

Conduit processes in crystal-rich dacitic magma and implications for eruptive cycles at Guagua Pichincha volcano, Ecuador

Conservation and restoration of St. George's church (Nördlingen, Germany), a 15th century Gothic church built using suevite from the Ries impact crater

Cyclic shear zone cataclasis and sintering during lava dome extrusion: Insights from Chaos Crags, Lassen Volcanic Center (USA)

Decarbonation and thermal microcracking under magmatic P-T-f CO2 conditions: the role of skarn substrata in promoting volcanic instability

Determination of permeability using a classic Darcy water column

Does an inter-flaw length control the accuracy of rupture forecasting in geological materials?

Elastic moduli evolution and accompanying stress changes with increasing crack damage: implications for stress changes around fault zones and volcanoes during deformation

Estimating in situ rock mass strength and elastic modulus of granite from the Soultz-sous-Forêts geothermal reservoir (France)

Evidence for the development of permeability anisotropy in lava domes and volcanic conduits

Experimental constraints on phreatic eruption processes at Whakaari (White Island volcano)

Experimental generation of volcanic pseudotachylytes: Constraining rheology

Experimental investigation of the mechanical properties of synthetic magnesium sulfate hydrates: Implications for the strength of hydrated deposits on Mars

Exploring the scale-dependent permeability of fractured andesite

Fire resistance of the Mt. Epomeo Green Tuff, a widely-used building stone on Ischia Island (Italy)

Flank instability assessment at Kick-’em-Jenny submarine volcano (Grenada, Lesser Antilles): a multidisciplinary approach using experiments and modeling

Forecasting volcanic eruptions and other material failure phenomena: An evaluation of the failure forecast method

Fracture and compaction of andesite in a volcanic edifice.

Fracture of magma containing overpressurised pores

Friendly fire: Engineering a fort wall in the Iron Age

From permanent flank sliding to catastrophic collapse and explosive eruptions at basaltic volcanoes: the role of shallow intrusive magma bodies

From rock to magma and back again: The evolution of temperature and deformation mechanism in conduit margin zones

Hot climate inhibits volcanism on Venus: Constraints from rock deformation experiments and argon isotope geochemistry

Hot pressing in conduit faults during lava dome extrusion: Insights from Mount St. Helens 2004–2008

How tough is tuff in the event of fire?

Hydrothermal alteration can result in pore pressurization and volcano instability

Hydrothermal alteration of andesitic lava domes can lead to explosive volcanic behaviour

Impact of stylolites on the mechanical strength of limestone

Increase in radon emission due to rock failure: An experimental study

Inelastic Compaction in High-Porosity Limestone Monitored Using Acoustic Emissions

Inelastic compaction and permeability evolution in volcanic rock

Influence of temperature on brittle creep in sandstones

Laboratory simulations of tensile fracture development in a volcanic conduit via cyclic magma pressurisation

Large-scale lava dome fracturing as a result of concealed weakened zones

Local geology controlled the feasibility of vitrifying Iron Age buildings

Low surface gravitational acceleration of Mars results in a thick and weak lithosphere: Implications for topography, volcanism, and hydrology

Mechanical behaviour and failure modes in the Whakaari (White Island volcano) hydrothermal system, New Zealand

Mechanical behaviour of dacite from Mount St. Helens (USA): A link between porosity and lava dome extrusion mechanism (dome or spine)?

Mechanical behaviour of the Rotokawa Andesites (New Zealand): Insight into permeability evolution and stress-induced behaviour in an actively utilised geothermal reservoir

Mechanics of Time-Dependent Deformation in Crustal Rocks

Mechanisms of time-dependent deformation in porous limestone

Micromechanics of brittle creep in rocks

Microstructural and petrophysical properties of the Permo-Triassic sandstones (Buntsandstein) from the Soultz-sous-Forêts geothermal site (France)

Microstructural controls on the physical and mechanical properties of edifice-forming andesites at Volcán de Colima, Mexico

Modelling the time-dependent rheological behaviour of heterogeneous brittle rocks

Numerical Approach to Creep of Rock Based on the Numerical Manifold Method

Permeability and porosity relationships of edifice-forming andesites: A combined field and laboratory study

Permeability of volcanic rocks to gas and water

Petrophysical properties, mechanical behaviour, and failure modes of impact melt-bearing breccia (suevite) from the Ries impact crater (Germany)

Physical and mechanical property relationships of a shallow intrusion and volcanic host rock, Pinnacle Ridge, Mt. Ruapehu, New Zealand

Physical property relationships of the Rotokawa Andesite, a significant geothermal reservoir rock in the Taupo Volcanic Zone, New Zealand

Pore pressure embrittlement in a volcanic edifice

Porosity evolution at the brittle-ductile transition in the continental crust: Implications for deep hydro-geothermal circulation

Pressure Controlled Permeability in a Conduit Filled with Fractured Hydrothermal Breccia Reconstructed from Ballistics from Whakaari (White Island), New Zealand

Quantifying the role of hydrothermal alteration in creating geothermal and epithermal mineral resources: The Ohakuri ignimbrite (Taupō Volcanic Zone, New Zealand)

Rapid solid-state sintering in volcanic systems

Rate- and strain-dependent brittle deformation of rocks

Reconstructing magma failure and the degassing network of dome-building eruptions

Slip on 'weak' faults by the rotation of regional stress in the fracture damage zone

Strain-induced permeability increase in volcanic rock

Strain‐Dependent Rheology of Silicate Melt Foams: Importance for Outgassing of Silicic Lavas

Strength and permeability recovery of tuffisite-bearing andesite

Stylolites in limestones: Barriers to fluid flow?

The Brittle-Ductile Transition in Porous Limestone Imaged by X-Ray Computed Tomography and Digital Image Correlation

The Brittle‐Ductile Transition in Porous Limestone: Failure Mode, Constitutive Modeling of Inelastic Deformation and Strain Localization