Papers by Paula Marques Figueiredo
The following doctoral thesis aim is to improve the knowledge on the neotectonic structures prese... more The following doctoral thesis aim is to improve the knowledge on the neotectonic structures present in the southwest Portugal and its characterization seismogenic, so that the assessment of the seismic hazard for this area is improved. As such, a particular emphasis was given towards the recognition of the Plio-Pleistocene deformation and their quantification, in order to understand the seismic cycles associated with the structures that evidenced seismic activity within this time period. Previous works led to the identification of seismogenic structures for this area, with known activity for the late Plio-Quaternary particularly in the emerged region, although evidences of paleoseismological or historical seismicity directly associated with those structures were not found. Studies developed during the last 2 decades led to the identification of multiple active seismogenic structures located in the offshore region, along the Southwest Continental Margin. The recognition of active structures, both emerged and submerged, as well as instrumental seismicity data, suggests the existence of a complex regional structure that might have been developed since the late Miocene, but its Plio-Pleistocene component is still poorly characterized.
Abstracts with programs, 2022
This video is the recording of the fourth webinar RDAP “Ask me Anything” town hall series entitle... more This video is the recording of the fourth webinar RDAP “Ask me Anything” town hall series entitled “Data Management for GIS projects”, held on February 26, 2020. It was jointly sponsored by RDAP a...
On August 9, 2020, an Mw5.1 earthquake ruptured the uppermost crust near the town of Sparta, Nort... more On August 9, 2020, an Mw5.1 earthquake ruptured the uppermost crust near the town of Sparta, North Carolina. The earthquake generated a ~2 km-long surface rupture, the first co-seismic faulting rupture identified in the Eastern United States. Combining deep learning earthquake phase picking, and matched filter detection, with differential-travel times relocation, we obtain a catalog of 1761 earthquakes with high-resolution locations, about 5.8 times the number of events listed in the standard NEIC catalog. Our results show the Sparta mainshock has a centroid depth of 1.3 km and nucleated near the intersection point of two fault strands, a blind strike-slip fault where the rupture possibly initiated, and a reverse fault associated with the identified surface rupture, possibly part of a flower structure-like diffuse fault zone. We also observe that earthquake stress drops during the Sparta sequence are on the lower end of estimates for similar magnitude Eastern North American earthqua...
Geological Society of America Abstracts with Programs
Geological Society of America Abstracts with Programs
This video is the recording of the fourth webinar RDAP “Ask me Anything” town hall series entitle... more This video is the recording of the fourth webinar RDAP “Ask me Anything” town hall series entitled “Data Management for GIS projects”, held on February 26, 2020. It was jointly sponsored by RDAP a...
Tese de doutoramento, Geologia (Geodinâmica Interna), Universidade de Lisboa, Faculdade de Cienci... more Tese de doutoramento, Geologia (Geodinâmica Interna), Universidade de Lisboa, Faculdade de Ciencias, 2015
VIII Simposio sobre el Margen Iberico Atlantico (MIA15), del 21 al 23 de septiembre de 2015, Mala... more VIII Simposio sobre el Margen Iberico Atlantico (MIA15), del 21 al 23 de septiembre de 2015, Malaga.-- 3 pages, 3 figures
Treatise on Geomorphology, 2021
Quaternary Research, 2020
ABSTRACTCryoplanation terraces are prominent but enigmatic landforms found in present and past pe... more ABSTRACTCryoplanation terraces are prominent but enigmatic landforms found in present and past periglacial environments. Geomorphologists have debated for more than a century over processes involved in the formation of these elevated, step-like, bedrock features. Presented here are the first numerical surface exposure ages and scarp retreat rates from cryoplanation terraces in the Yukon-Tanana Upland (YTU) in Alaska, part of unglaciated eastern Beringia, obtained from terrestrial cosmogenic nuclides (TCN) in surface boulders. Ages comprise six 10Be TCN ages from two terrace treads near Eagle Summit and six 36 Cl ages from two treads on Mt. Fairplay. Based on these exposure ages, scarps at both locations were last actively eroding from 49 to 22.4 ka. Both locations exhibit time-transgressive development, particularly near scarp-tread junctions. Boulder exposure ages and distances between sampled boulder locations were used to estimate scarp retreat rates of 0.11 to 0.56 cm/yr. These ...
AGU Fall Meeting Abstracts, Dec 1, 2019
Abstracts with programs, 2023
Geological Society of America Abstracts with Programs
Geological Society of America Abstracts with Programs, 2020
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Papers by Paula Marques Figueiredo
Palabras clave: paleossismologia, falhas activas, geomorfologia tectónica, falha da Vilariça
Abstract: Two new trenches were recently opened in the central segment (Vilariça) of the Manteigas-Vilariça-Bragança fault to undertake a detailed paleoseismological study at Quinta do Vale Meão (Vilariça Basin) and an exploratory study at Quinta da Canameira (Longroiva Basin), respectively. Preliminary results show that recent sediments are deformed and faulted in Vale Meão, while at Canameira they showed apparent deformation requiring further exploration to confirm the observations. The new data obtained in Vale Meão confirmed the paleoseismic activity previously inferred from a nearby trench, though the deformation observed in this study was much lower than expected. The smaller amount of deformation that was detected at the Vale Meão trench may be due to the predominant strike-slip (left-lateral) kinematics and to strain distribution in the affected fine grained sediments, which are locally more than 8 m thick.