Special Issue: the Cascadia Subduction ZoneVol. 2 No. 4
The Cascadia Subduction Zone: Grand Challenges and Research Frontiers
Subduction zones generate the world’s largest earthquakes. Their strong shaking and related cascading hazards such as tsunamis, landslides, liquefaction, fire, etc., make them the source of some of the most devastating natural hazards. The Cascadia Subduction Zone (CSZ), spanning three states in the U.S. and British Columbia in Canada, is such a hazardous system and at the same time represents one of the world’s best natural earthquake laboratories. While the Cascadia megathrust is seismically quiet compared to many other subduction zones, fundamental discoveries on phenomena including slow slip and tremor have shown it to be a hub of tectonic activity. Moreover, the region hosts one of the most comprehensive geologic records of past great earthquakes. Research involving the CSZ has yielded some of the most intriguing recent advances in the physics and impacts of earthquakes, and, fresh ideas and future scientific endeavors are required to foster and accelerate this progress.
Production Editors: Alice-Agnes Gabriel and Christie Rowe
Brendan Crowell (geodesy)
Colin Amos (tectonic and EQ geology)
Isabel Hong (paleoseismology)
Jason Padgett (paleoseismology)
Pieter-Ewald Share (high-res geophysical structural imaging)
Emilie Hooft (shoreline crossing seismics)
Harold Tobin (marine geology, fluids, faults)
Cover caption: One of the Pacific Northwest Geodetic Array (PANGA) sites atop Mt. Olympus, Washington. Photo credit: Timothy Melbourne (Central Washington University).
Special Issue: 2023 Türkiye/Syria earthquakesVol. 2 No. 3
Insights and lessons from the devastating 2023 Kahramanmaraş, Türkiye earthquake sequence
We are all absolutely heartbroken at the sheer devastation and loss of life following the Mw7.8 and Mw7.5 earthquakes that hit Türkiye and Syria in January 2023. As seismologists and earthquake scientists, we know all too well about the power of earthquakes, yet the horrendous scenes coming out of Türkiye and Syria have still hit us hard. There will be numerous scientific analyses from the dense geophysical and geological datasets that captured these earthquakes and their consequences. We hope that these lessons will directly feed into improved disaster risk reduction worldwide. To improve dissemination of these vital scientific insights, Seismica is announcing a special journal issue on this important earthquake sequence, with papers free-to-publish and free-to-read.
For more information on submitting a paper, please see the issue announcement.
Cover caption: Displacement along the Narli fault, which initiated the 2023 Kahramanmaraş, Türkiye earthquake sequence. Farm road east of the town of Narli displaced 3 m left-laterally and 80 cm vertically up-to-the-east across a 6-m-wide graben. Geologists Rich Koehler (University of Nevada Reno) and Kevin Clahan (Lettis Consultants International, Inc.) mark the linear northern margin of the road. Photo credit: Cengiz Yildirim (Istanbul Technical University)”
Cover caption: Installation of a weather station and self-sufficient seismic box on a Greenlandic outlet glacier. The glacier is called Sermeq Kujalleq in the Kangia icefjord (also known as Jakobshavn isbræ). The photo was taken at the fast ice stream approximately 60 km from the calving front. Installation of instruments at such locations can only be achieved by helicopter. The installation of the stations was part of the 2021 field campaign within the COEBELI project from the University of Zürich. The COEBELI project aims at investigating short-term ice flow dynamics with a combination of various field measurements. The total field campaign consisted of the installation of eight self-sufficient seismic box stations, two weather stations, two GPS stations, terrestrial radar measurements, and time-lapse cameras. More field campaigns with a larger number of sensors were done in 2022 and are planned for the summer of 2023. Credit: Ana Nap (photographer) and Adrien Wehrlé (in the picture)
Cover caption: Ocean bottom seismometer (OBS) recovery. OBS recovery occurred in March 2017 as part of the PI-LAB (Passive Imaging of the lithosphere-asthenosphere boundary) experiment and EURO-LAB (Experiment to Unearth the Rheological lithosphere-asthenosphere boundary). The experiments included 39 ocean bottom seismometers deployed for 1 year around the Chain Fracture Zone and the equatorial Mid-Atlantic Ridge. The OBS were co-located with 39 ocean bottom magnetotelluric instruments deployed as part of the CA-LAB (Central Atlantic Imaging of the lithosphere-asthenosphere boundary) experiment. There were also several co-located active source experiments. The goal of the experiments was to determine what makes a plate, ‘plate-like’ by studying young ocean lithosphere with a range of sensitivities and resolutions at a slow spreading end member, the Mid-Atlantic Ridge. Credit: Catherine Rychert and Michael Kendall.