Dan Hollis
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View article: State of the <scp>UK</scp> Climate in 2024
State of the <span>UK</span> Climate in 2024 Open
This report provides a summary of the state of the UK's climate in 2024. It is one of a series of annual reports published in the International Journal of Climatology (IJC) since 2017. It provides the latest assessment of UK climate trends…
View article: Gridding uncertainties in UK climate data – progress and improvements
Gridding uncertainties in UK climate data – progress and improvements Open
HadUK-Grid is a dataset of gridded in situ climate data for the UK. It comprises monthly, seasonal, annual and long-term average values for 11 variables at 1km resolution. Three of these variables are also available at daily resolution. It…
View article: Producing a nearest neighbour check for station sunshine data as part of a station-satellite blended sunshine duration dataset for the UK
Producing a nearest neighbour check for station sunshine data as part of a station-satellite blended sunshine duration dataset for the UK Open
Sunshine duration (SD) is an important climate variable in the UK, with UK Met Office records extending back to the 1800s. However, the station network is spatially and temporally inhomogeneous, and the number of stations declined consider…
View article: Detecting hidden seismic swarms using a 300 nodal long-term array
Detecting hidden seismic swarms using a 300 nodal long-term array Open
Earthquake swarms may be driven by slow processes within fault zones, such as fluid migration, or silent slip events. A prominent example is the 2024 Mw 7.5 Noto earthquake in Japan, which was preceded by a significant seismic swarm, likel…
View article: Body waves from train noise correlations: potential and limits for monitoring the San Jacinto Fault, CA
Body waves from train noise correlations: potential and limits for monitoring the San Jacinto Fault, CA Open
SUMMARY A large portion of the stress release on seismic faults remains silent and undetected, requiring the development of novel observation techniques. Measuring traveltime perturbations from the correlation of ambient seismic noise at d…
View article: In Situ Velocity‐Strain Sensitivity Near the San Jacinto Fault Zone Analyzed Through Train Tremors
In Situ Velocity‐Strain Sensitivity Near the San Jacinto Fault Zone Analyzed Through Train Tremors Open
We utilize train tremors as P‐wave seismic sources to investigate velocity‐strain sensitivity near the San Jacinto Fault Zone. A dense nodal array deployed at the Piñon Flat Observatory is used to detect and identify repeating train energy…
View article: State of the <scp>UK</scp> Climate 2023
State of the <span>UK</span> Climate 2023 Open
This report provides a summary of the UK's weather and climate through the calendar year 2023, alongside the historical context for a number of essential climate variables. This is the tenth in a series of annual ‘State of the UK Climate’ …
View article: Spatial co‐localisation of extreme weather events: a clear and present danger
Spatial co‐localisation of extreme weather events: a clear and present danger Open
Extreme weather events have become a dominant feature of the narrative surrounding changes in global climate with large impacts on ecosystem stability, functioning and resilience; however, understanding of their risk of co‐occurrence at th…
View article: Spatial co-localization of extreme weather events: a clear and present danger
Spatial co-localization of extreme weather events: a clear and present danger Open
Extreme weather events have become a dominant feature of the narrative surrounding changes in global climate. with large impacts on ecosystem stability, functioning and resilience, however, understanding of their risk of co-occurrence at t…
View article: Noise-based ballistic wave passive seismic monitoring – Part 2: surface waves
Noise-based ballistic wave passive seismic monitoring – Part 2: surface waves Open
SUMMARY We develop a new method to monitor and locate seismic velocity changes in the subsurface using seismic noise interferometry. Contrary to most ambient noise monitoring techniques, we use the ballistic Rayleigh waves computed from 30…
View article: Passive Seismic Ambient Noise Surface Wave Tomography Applied to Two Exploration Targets in Ontario, Canada
Passive Seismic Ambient Noise Surface Wave Tomography Applied to Two Exploration Targets in Ontario, Canada Open
SummaryAs mineral exploration seeks deeper targets and targets under cover, the need for low cost and low impact subsurface imaging is increasingly important. A recent addition to the toolbox of geophysical methods is ambient noise surface…
View article: HadUK‐Grid—A new UK dataset of gridded climate observations
HadUK‐Grid—A new UK dataset of gridded climate observations Open
HadUK‐Grid is a new dataset of gridded climate observations for the UK produced by the Met Office Hadley Centre for Climate Science and Services. The dataset interpolates in situ observations to a regular grid using methods developed in a …
View article: Monitoring of fields using body and surface waves reconstructed from passive seismic ambient noise
Monitoring of fields using body and surface waves reconstructed from passive seismic ambient noise Open
International audience
View article: Ambient noise multimode Rayleigh and Love wave tomography to determine the shear velocity structure above the Groningen gas field
Ambient noise multimode Rayleigh and Love wave tomography to determine the shear velocity structure above the Groningen gas field Open
SUMMARY The Groningen gas field is one of the largest gas fields in Europe. The continuous gas extraction led to an induced seismic activity in the area. In order to monitor the seismic activity and study the gas field many permanent and t…
View article: High-resolution seismic event detection using local similarity for Large-N arrays
High-resolution seismic event detection using local similarity for Large-N arrays Open
We develop a novel method for seismic event detection that can be applied to large-N arrays. The method is based on a new detection function named local similarity, which quantifies the signal consistency between the examined station and i…