The collision generates an arc of active volcanoes, small to large earthquakes and on occasion small to large tsunamis. Eastern aleutian volcanic arc digital model version 1. The timing of aleutian arc inception and nascent magmatic evolution. Since the last revisions to the map for alaska in 2007, scientists have made significant advances in understanding active faulting, fault slip rates, and fault behavior. This software is available to download from the publisher site. Recently available downscaled ocean climate models for the bering sea and aleutian arc offer the opportunity to assess climate vulnerability for upper trophic level consumers such as marine birds. Aftershock zones and dates of major earthquakes are indicated. Volcanoes have influenced the aleutian arc in two ways. The aleutian arc is the arcuate arrangement of mountain ranges and flanking submerged margins that forms the northern rim of the pacific basin from the kamchatka peninsula russia eastward more than 3,000 km to cooke inlet fig. This data set contains point locations of geothermally active areas as compiled by motyka et al.
Figure 2 world plate boundary map with location of the eastern aleutian arc modified from figure in this dynamic earth with permission. Waves can have various effects on volcanic coasts, depending on the type of volcanic sediment present at the shore. Clip the data frame to make your map polished, professional esri. Our research team is exploring seismic and aseismic slip along the alaska aleutian arc and studying the prehistoric record of megathrust earthquakes and tsunamis along the alaska aleutian subduction zone. That the aleutian arc is capable of sending damaging tsunamis across the pacific basin is illustrated by those produced by the series of midtwentieth century m 89 ruptures in the central and eastern. Earthquakes, plate subduction, and stress reversals in the. The alaska mapping initiative supports acquisition of new topographic map. At depths of 100 and 150 km, the pvelocity anomalies under the aleutian arc change their structure radically. Use arcmap, arccatalog, arcglobe, and arcscenethe traditional arcgis desktop applicationsto create maps, perform spatial analysis, manage geographic data, and share your results. The aleutian islands may have among the most abundant and diverse deepsea, coldwater, coral and sponge communities in the world.
The aleutian arc provides an excellent opportunity to study geochemical fluxes from slab to surface because previous studies have shown that subducted marine sediments unambiguously contribute to most aleutian lavas sun, 1980, tera et al. Shoreline erodability along volcanic coasts ranges from very erodible for ash and unconsolidated sediment to very resistant for basalt. Arrows indicate the locations of the lavas analyzed in this study. The aleutian arc is a unique place to carry out such research. To obtain a more detailed view of a specific mosaic move the cursor over the mosaic area and click to select. It consists of a number of active and dormant volcanoes that have formed as a result of subduction along the aleutian trench. The pacific plate subducts beneath the north american plate along the aleutian trench of alaska. In pursuance of this new program, japanese troops occupied lae world war ii. Of the more than 325,000 structure forming invertebrate organisms accounted for in the images, corals 49% and sponges 42% were most commonly identified, while stylasterids a distant cousin to corals also known as hydrocorals were not as abundant at 8%. Usa geography quizzes fun map games sheppard software.
The aleutian islands possibly from chukchi aliat, island are a chain of more than 300 small volcanic islands forming an island arc situated in the northern pacific ocean, occupying an area of 6,821 sq mi. The map shows an island arc in alaska named the aleutian. Sep 27, 2016 a bathymetric features of the aleutian arc system. The trench extends for 3,400 km from a triple junction in the west with the ulakhan fault and the northern end of the kurilkamchatka trench, to a junction with the northern end of the queen charlotte fault system in the east. Esri gis products arcgis mapping software for desktop, saas. Continental crust layer of the aleutian arc 3d model. Students learn basic terms for land and sea features of the aleutian arc in unangam tunuu, the native language of the aleutian chain in alaska, or in sugtstun, the language of the alutiiq and sugpiaq. Threedimensional inversion of regional p and s arrival times. The timing of aleutian arc inception and nascent magmatic. Aleutian arc volcanism is the result of the active subduction of the pacific plate beneath the north american plate. A 3dimensional model figure 1 of the interaction of oceanic and continental tectonic plates along the eastern portion of the aleutian volcanic arc helps in the visualization of basic tectonic, geodetic, and.
The source code for this program is provided in the ftp area of this report. Forming the aleutian arc in the northern pacific ocean, approximately 3,400 miles from albuquerque and the university of new mexico, the aleutian islands are a perfect destination to conduct research that could one day, impact earth and its inhabitants. The aleutian arc is the arcuate arrangement of mountain ranges and flanking submerged margins that forms the northern rim of the pacific basin from the kamchatka peninsula russia eastward more. Since the last revisions to the map for alaska in 2007. Tracking alongarc sediment inputs to the aleutian arc using thallium isotopes. Researcher studies volcanic gases in remote areas of world. In order to better examine the transition, 1448 earthquakes are relocated from data recorded by a regional seismic network in the eastern aleutian arc, using an improved threedimensional velocity model and accurate ray tracing. Plate subduction beneath the 1500kmlong segment of the eastern aleutian arc between kodiak and atka islands 154sup 0w and 176sup 0w longitude is studied with observations from teleseismic data. First, they have been constructive agents, creating islands as eruption after eruption has vented rock and ash. Location map and tectonic setting of the central aleutian arc and unimak island. The red line in the bathymetric map indicates the location of the bathymetry profile shown in fig. Of the more than 325,000 structure forming invertebrate organisms. The aleutian islands possibly from chukchi aliat, island are a chain of more than 300 small volcanic islands forming an island arc situated in the northern pacific ocean, occupying an area of 6,821 sq mi 17,666 sq km and extending about 1,200 mi 1,900 km westward from the alaska peninsula toward the kamchatka peninsula.
Aleutian islands map southwestern alaska, alaska mapcarta. The earths tectonic plates figure 2 produce spectacular topography, active volcanoes, and powerful earthquakes when they collide at convergent boundaries. Singleevent firstmotion solutions are determined from these rays for 31 slab events. Eightynine volcanoes with eruptive phases in the quaternary are mapped as points centered in the active caldera. Apr 17, 2019 an assessment of climate change vulnerability for important bird areas in the bering sea and aleutian arc. Because of the variety of geothermal activity present at any given site, each site has been mapped. After the map was digitized and projected into geographic, the digital chart of the world coastline 1. The eastern aleutian arc shows local lowvelocity anomalies, which may reflect rollback flows in the mantle wedge over the subducting pacific plate. Metadata for aleutian islands environmental sensitivity. This data set contains point locations of active volcanoes as compiled by motyka et al. The primary data base consists of hypocenters of earthquakes for the period 19651975, carefully. Alaskan tectonics are dominated by the pacificnorth american plates. The newest addition to the arcgis desktop product line integrates your gis workflows in a single elegant application.
Students learn basic terms for land and sea features of the aleutian arc in. Alaska ifsar acquisition supports the broader national 3d elevation program. What does the arc suggest about its surrounding geographic region. The arrow shows the revised nuvel1a pacificnorth america relative motion.
Threedimensional inversion of regional p and s arrival. Tsunami recurrence in the eastern alaskaaleutian arc. The raw gloria data were processed and digitally mosaicked to produce 31 digital mosaics of a 3degree by 2degree area. Of these, 36 are indicated as haying been active since 1760. We present a reevaluation of the seismological properties of the aleutian tsunami earthquake of 1946 april 1, characterized by a deceptively low co. World plate boundary map with location of eastern aleutian arc. Rather than teach pro from the start, this book focuses on the difference between pro. The bering sea and aleutian arc is a predominantly subarctic, productive system that is influenced by sea ice, but less so than areas farther north in the arctic ocean. Below is an index map of the gloria imagery available for the u. Figures 1 and 2 comprise three maps showing, respectively, the location of kanaga island in the aleutian islands, a physical map of kanaga island showing the. Bathymetric map of the aleutian trench and bering sea.
The aleutian trench or aleutian trough is an oceanic trench along a convergent plate boundary which runs along the southern coastline of alaska and the aleutian islands. In 1946 and 1964, large tsunamis were generated from magnitude 8 earthquakes near unimak island. Atep 20062008 uaf geophysical institute a53 aleutian arc. The national seismic hazard maps developed by the usgs show the spatial probability of peak earthquakedriven ground motion levels. Aleutian islands coastal resources inventory and environmental sensitivity maps. The aleutian islands are a chain of 14 large volcanic islands and 55 smaller ones, forming part of the aleutian arc in the northern pacific ocean, occupying an area of 6,821 sq mi 17,666 km. This will be a problem whenever this coverage is reprojected until arcinfo resolves the problem in the software. Jun 07, 2016 the pacific plate subducts beneath the north american plate along the aleutian trench of alaska.
The solomons, papua, madagascar, the aleutians, and burma, july 1942may. The megathrust boundary between the plates results in both the 4,000kmlong aleutian trench and in the arc of active. Coats abstract at least 76 major volcanoes, active and extinct, have been recognized in the aleutian arc, extending from buldir. Understanding the genesis of plutonic rocksthose that crystallized from slowlycooling magmais the key to knowing more about continental crust formation. Arc magmatism like that in the aleutian islands is the most important process that generates the new crust that makes up earths continents, geoscientists have found. Switching to arcgis pro from arcmap is an invaluable resource for those looking to migrate from arcmap to arcgis pro. An assessment of climate change vulnerability for important.
Tracking alongarc sediment inputs to the aleutian arc. The raw gloria data were processed and digitally mosaicked to produce 31 digital mosaics of a 3degree by 2. The aleutian arc data system is an interactive database providing access to chemical, petrographic and spatial data concerning the geology of the aleutian islands. Geological survey, one for the chukchi sea and arctic ocean, and one for the aleutian trench and bering sea. Postglacial eruptive history and geochemistry of semisopochnoi volcano, western aleutian islands, alaska, is available for download here. Volcanoes along the southern segment of the izuogasawara arc and the western aleutian arc west of adak are underlain by thin crust 1020 km.
This projection is appropriate for mapping alaska, the aleutian islands, and the bering sea region only. The alaska series e projection was developed in 1972 by the usgs to publish a map of alaska at 1. Projectionspecific parameters are set by the software. Although taking its name from the aleutian islands. Tracking alongarc sediment inputs to the aleutian arc using. The aleutian islands are a chain of island to the west of southwestern alaska. The map shows an island arc in alaska named the aleutian arc. Arc software arc is a free statistical analysis tool for regression problems, as described in the book applied regression including computing and graphics. We analyzed seasonal and annual spatial projections from three climate models for two physical climate variables seawater temperature and sea ice and three forage variables large copepods. A 3dimensional model figure 1 of the interaction of oceanic and continental tectonic plates along the eastern portion of the aleutian volcanic arc helps in the visualization of basic tectonic, geodetic, and geophysical data in this active plate boundary region. Rather than teach pro from the start, this book focuses on the difference between pro and arcmap for a more rapid adjustment to common workflows. Follow these stepbystep directions to clip data frames in arcgis to create.
Alaskas subduction zone and potential for large tsunamis. A 3d model of the seismic heterogeneities of p and svelocities has been constructed down to 1100 km beneath the kurilekamchatka and aleutian subduction zones on the basis of the regional. Focal mechanisms are from the harvard cmt catalog, based on events with m w 6. In order to better examine the transition, 1448 earthquakes are relocated from data recorded by a regional seismic network in the eastern aleutian arc, using an improved threedimensional velocity model and. The collision generates an arc of active volcanoes, small to large earthquakes and on occasion. In january 1997, esri decided to revamp its gis software platform, creating a single integrated software architecture. Map of the aleutian islands and the alaska peninsula, showing.
1350 1157 1557 209 34 1536 689 760 1286 473 1072 551 1591 1485 529 487 686 719 1133 808 930 1290 502 1674 509 239 854 1063 1668 453 736 137 831 360 271 337 962 48 181 1160