Outputs (7)

The earthquake cycle in the dry lower continental crust: insights from two deeply exhumed terranes (Musgrave Ranges, Australia and Lofoten, Norway) (2021)
Journal Article
Menegon, L., Campbell, L., Mancktelow, N., Camacho, A., Wex, S., Papa, S., …Pennacchioni, G. (2021). The earthquake cycle in the dry lower continental crust: insights from two deeply exhumed terranes (Musgrave Ranges, Australia and Lofoten, Norway). Philosophical transactions. Series A, Mathematical, physical, and engineering sciences, 379(2193), Article 20190416. https://doi.org/10.1098/rsta.2019.0416

This paper discusses the results of field-based geological investigations of exhumed rocks exposed in the Musgrave Ranges (Central Australia) and in Nusfjord (Lofoten, Norway) that preserve evidence for lower continental crustal earthquakes with foca... Read More about The earthquake cycle in the dry lower continental crust: insights from two deeply exhumed terranes (Musgrave Ranges, Australia and Lofoten, Norway).

Stress fields of ancient seismicity recorded in the dynamic geometry of pseudotachylyte in the Outer Hebrides Fault Zone, UK (2020)
Journal Article
Campbell, L., Lloyd, G., Phillips, R., Walcott, R., & Holdsworth, R. (2021). Stress fields of ancient seismicity recorded in the dynamic geometry of pseudotachylyte in the Outer Hebrides Fault Zone, UK. Journal of the Geological Society, 178(1), Article jgs2020-101. https://doi.org/10.1144/jgs2020-101

Heterogeneous sequences of exhumed fault rocks preserve a record of the long-term evolution of fault strength and deformation behaviour during prolonged tectonic activity. Along the Outer Hebrides Fault Zone (OHFZ) in NW Scotland, numerous pseudotach... Read More about Stress fields of ancient seismicity recorded in the dynamic geometry of pseudotachylyte in the Outer Hebrides Fault Zone, UK.

Earthquake nucleation in the lower crust by local stress amplification (2020)
Journal Article
Campbell, L. R., Menegon, L., Fagereng, Å., & Pennacchioni, G. (2020). Earthquake nucleation in the lower crust by local stress amplification. Nature communications, 11(1), Article 1322. https://doi.org/10.1038/s41467-020-15150-x

Deep intracontinental earthquakes are poorly understood, despite their potential to cause significant destruction. Although lower crustal strength is currently a topic of debate, dry lower continental crust may be strong under high-grade conditions.... Read More about Earthquake nucleation in the lower crust by local stress amplification.

Rupture geometries in anisotropic amphibolite recorded by pseudotachylytes in the Gairloch Shear Zone, NW Scotland (2019)
Journal Article
Campbell, L. R., Phillips, R. J., Walcott, R. C., & Lloyd, G. E. (2019). Rupture geometries in anisotropic amphibolite recorded by pseudotachylytes in the Gairloch Shear Zone, NW Scotland. Scottish Journal of Geology, 55(2), 75-92. https://doi.org/10.1144/sjg2019-003

Recent earthquakes involving complex multi-fault rupture have increased our appreciation of the variety of rupture geometries and fault interactions that occur within the short duration of coseismic slip. Geometrical complexities are intrinsically li... Read More about Rupture geometries in anisotropic amphibolite recorded by pseudotachylytes in the Gairloch Shear Zone, NW Scotland.

Transient High Strain Rate During Localized Viscous Creep in the Dry Lower Continental Crust (Lofoten, Norway) (2019)
Journal Article
Campbell, L. R., & Menegon, L. (2019). Transient High Strain Rate During Localized Viscous Creep in the Dry Lower Continental Crust (Lofoten, Norway). Journal of Geophysical Research. Solid Earth, 124(10), 10240-10260. https://doi.org/10.1029/2019jb018052

Understanding the ability of the lower crust to support transient changes in stresses and strain rates during the earthquake cycle requires a detailed investigation of the deformation mechanisms and rheology of deep crustal fault rocks. Here, we show... Read More about Transient High Strain Rate During Localized Viscous Creep in the Dry Lower Continental Crust (Lofoten, Norway).

The Nusfjord exhumed earthquake source (Lofoten, Norway): deep crustal seismicity driven by bending of the lower plate during continental collision
Presentation / Conference Contribution
Menegon, L., Campbell, L., Fagereng, Å., & Pennacchioni, G. (2020, May). The Nusfjord exhumed earthquake source (Lofoten, Norway): deep crustal seismicity driven by bending of the lower plate during continental collision. Presented at European Geosciences Union (EGU) General Assembly 2020, Online

The origin of earthquakes in the lower crust at depth of 20-40 km, where dominantly ductile deformation is expected, is highly debated. Exhumed networks of lower crustal coeval pseudotachylytes (quenched frictional melt produced during seismic slip)... Read More about The Nusfjord exhumed earthquake source (Lofoten, Norway): deep crustal seismicity driven by bending of the lower plate during continental collision.

Pyroxene low-temperature plasticity and fragmentation as a record of seismic stress evolution in the lower crust
Presentation / Conference Contribution
Campbell, L., & Menegon, L. (2020, May). Pyroxene low-temperature plasticity and fragmentation as a record of seismic stress evolution in the lower crust. Presented at European Geosciences Union General Assembly 202, Online

Seismic rupture of the lower continental crust requires a high failure stress, given large lithostatic stresses and potentially strong rheologies. Several mechanisms have been proposed to generate high stresses at depth, including local amplification... Read More about Pyroxene low-temperature plasticity and fragmentation as a record of seismic stress evolution in the lower crust.