International lower limb collaborative (INTELLECT) study: a multicentre, international retrospective audit of lower extremity open fractures

Trauma remains a major cause of mortality and disability across the world1, with a higher burden in developing nations2. Open lower extremity injuries are devastating events from a physical3, mental health4, and socioeconomic5 standpoint. The potential sequelae, including risk of chronic infection and amputation, can lead to delayed recovery and major disability6. This international study aimed to describe global disparities, timely intervention, guideline-directed care, and economic aspects of open lower limb injuries

Study of seismic clusters at Bahía de Banderas Región, México

The coast in the state of Jalisco and south of Nayarit is located within a region of high seismic potential, increasing population, and tourism development. This motivated Civil Defense authorities of Jalisco and the Universidad de Guadalajara to launch in the year 2000 the assessment of the seismic risk of the region. This work focuses in the seismicity study of the area of Bahía de Banderas and northern coast of Jalisco, which is actually a seismic gap. We perform an analysis of available seismograms to characterize active crustal structures, their relationship to surface morphology, and possible extent of these structures into the bay shallow parts. The data consist of waveforms recorded during 2003 when the seismograph network spanned the region. Our method is based on the identification of seismic clusters or families using cross-correlation of waveforms, earthquake relocation and modeling of fault planes. From an initial data set of 404 located earthquakes, 96 earthquakes with ML < 3.6 are related to 17 potentially active continental structures. We present fault plane model for 11 structures. A subgroup of 7 structures is aligned parallel to the Middle America Trench, as a possible consequence of oblique subduction. The foci of the earthquakes were grouped into clusters corresponding to fault dimensions of hundred of meters, may be considered as asperities or barriers in tectonic structures with lengths between 10 and 30 km. These structures could generate shallow earthquakes with magnitudes between 5.0 and 6.0 and represent an additional seismic threat to the region

Seismicity at ceboruco volcano, Mexico

[No abstract available

Spatial structure of the spider crab, Maja brachydactyla population: Evidence of metapopulation structure

The Ceboruco stratovolcano (2,280 m.a.s.l.) is located in Nayarit, Mexico, at the western end of the Mexican volcanic belt, near several population centers and by the side of a strategic highway. During the last 1,000 years it has had, on the average, one eruption every 125 years. It last eruptive activity began in 1870, and during the following 5 years it presented superficial activity including vapor emissions, ash falls, and rhyodacitic lava flows along the southeast side. A data set consisting of 139 low-frequency volcanic-type earthquakes, recorded from March 2003 to July 2008 at the CEBN triaxial short period digital station on the southwestern side of the volcano, was classified according to waveform and spectral characteristics into four families: short duration, extended coda, bobbin, and modulated amplitude. Approximate hypocentral locations indicate that there is no particular location for events of any family, but rather that all events occur at different points within the volcano. The presence of ongoing volcanic-earthquake activity together with the ongoing vapor emissions indicate that the Ceboruco volcano continues to be active, and the higher occurrence rates of short-duration events, as compared with those for the other families, could indicate an increase in the stress in the volcanic edifice. This apparent stress increase, together with the fact that the last eruption occurred 143 years ago, tell us that the Ceboruco may be approaching a critical state, and may represent a hazard to the surrounding communities and economic activities. " 2013 Springer-Verlag Berlin Heidelberg.",,,,,,"10.1007/s00445-013-0755-9",,,"http://hdl.handle.net/20.500.12104/44648","http://www.scopus.com/inward/record.url?eid=2-s2.0-84883609943&partnerID=40&md5=36690c1c607bb363a2400bac84931036",,,,,,"10",,"Bulletin of Volcanology",,"

Near shore submarine hydrothermal activity in Bahia Banderas, western Mexico

Shallow submarine hydrothermal activity was detected in the Bahia de Banderas area, Mexico. Volcanic-type tremors were recorded by portable seismological stations onshore. Vent samples suggest a depositional sequence dominated by carbonates in the first stage (calcite and dolomite), followed by apatite and late barite veins. Layers of sequential deposition of sulfides were also observed, and are interpreted as cyclic variations of sulphur fugacity

Some insights about the activity of the Ceboruco Volcano (Nayarit, Mexico) from recent seismic low-frequency activity

The Ceboruco stratovolcano (2,280 m.a.s.l.) is located in Nayarit, Mexico, at the western end of the Mexican volcanic belt, near several population centers and by the side of a strategic highway. During the last 1,000 years it has had, on the average, one eruption every 125 years. It last eruptive activity began in 1870, and during the following 5 years it presented superficial activity including vapor emissions, ash falls, and rhyodacitic lava flows along the southeast side. A data set consisting of 139 low-frequency volcanic-type earthquakes, recorded from March 2003 to July 2008 at the CEBN triaxial short period digital station on the southwestern side of the volcano, was classified according to waveform and spectral characteristics into four families: short duration, extended coda, bobbin, and modulated amplitude. Approximate hypocentral locations indicate that there is no particular location for events of any family, but rather that all events occur at different points within the volcano. The presence of ongoing volcanic-earthquake activity together with the ongoing vapor emissions indicate that the Ceboruco volcano continues to be active, and the higher occurrence rates of short-duration events, as compared with those for the other families, could indicate an increase in the stress in the volcanic edifice. This apparent stress increase, together with the fact that the last eruption occurred 143 years ago, tell us that the Ceboruco may be approaching a critical state, and may represent a hazard to the surrounding communities and economic activities. © 2013 Springer-Verlag Berlin Heidelberg

Near shore submarine hydrothermal activity in Bahia Banderas, western Mexico

Shallow submarine hydrothermal activity was detected in the Bahia de Banderas area, Mexico. Volcanic-type tremors were recorded by portable seismological stations onshore. Vent samples suggest a depositional sequence dominated by carbonates in the first stage (calcite and dolomite), followed by apatite and late barite veins. Layers of sequential deposition of sulfides were also observed, and are interpreted as cyclic variations of sulphur fugacity

Comparison of seismic characteristics of four cycles of dome growth and destruction at colima volcano, Mexico, from 1991 to 2004

From 1990 to 2004, four cycles of dome growth and explosive dome destruction occurred at the Colima volcano. In this paper, we describe these cycles, focusing on the seismic characteristics of the last three cycles from 1997 and 2004, for which we have the best data. Four episodes of dome building occurred: from early 1991 to late 1992, from November 1998 into January 1999, from November 2001 through February 2003, and from September 2004 into 2005. The rate of extrusion during these episodes ranged from a low-extrusion rate accompanied by seismicity and evolved with time to a high rate of aseismic extrusion for the last episode in 2004. The first of these four extrusive episodes was followed by dome-destroying explosions in July 1994. The second extrusive episode was followed by four dome-destroying explosions over six months and a fifth explosion 17 months later, while the third extrusive episode was followed by three dome-destroying explosions over two months. A fourth extrusive episode began in 2004. The nature of each explosion was somewhat different. For each of the explosions, we compare the total seismic energy released (1) during the hours prior to each explosion, (2) during each explosion, and (3) during the hours after each explosion. We also propose an additional method for classifying the explosions based on coupled acoustic waves and describe characteristics of the volcanic earthquakes recorded. We use data from the 10 May 1999 explosion to construct a new P-wave velocity model for the upper structure of the volcano

Characteristics of seismicity in the coast and north of Jalisco Block, Mexico

Several studies of local seismicity were carried out between 1996 and 1998 on the coast and north of the Jalisco Block (JB) using a portable seismic network consisting of five Lennartz M88 seismographs with Le 3D (1 Hz) seismometers. The data from these studies, complemented with data from RESCO (Colima Seismic Network), is used to characterize three seismogenic zones in the region. One seismicity zone, located east of the Middle America Trench (MAT), under the continental plate, is associated with the interaction of the Rivera and North America plates, and can be characterized as a Double Seismic Zone (DSZ) with geometry suggesting a bending plate and, probably, oblique subduction; this pattern is clearer south of the 20°N parallel. A second zone of continental intraplate seismicity is located between Ameca and Amatlan de Cañas, in the northeastern part of the study region, where the source depths vary from very shallow to about 35 km. The third zone is Bahía de Banderas where the stress pattern seems to be very complex; here we observe different types of seismic events: the first type consists of shallow events, located in the southern part of the Bay and a under continental area, that seems to be associated with the interplate (Rivera/North America) activity. A second event type with depths between 10 and 30 km, seems to be related to features that cross the Bay in an EW direction. In this zone, there is also a high shallow continental seismicity, which agrees with continental topographic features. © 2002 Elsevier Science B.V. All rights reserved