Our research team is exploring seismic and aseismic slip along the alaskaaleutian arc and studying the prehistoric record of megathrust earthquakes and tsunamis along the alaskaaleutian subduction. In pursuance of this new program, japanese troops occupied lae world war ii. 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. Aleutian islands coastal resources inventory and environmental sensitivity maps. Although taking its name from the aleutian islands. Metadata for aleutian islands environmental sensitivity. Postglacial eruptive history and geochemistry of semisopochnoi volcano, western aleutian islands, alaska, is available for download here. 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. 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. The raw gloria data were processed and digitally mosaicked to produce 31 digital mosaics of a 3degree by 2degree area. Tracking alongarc sediment inputs to the aleutian arc using thallium isotopes. The megathrust boundary between the plates results in both the 4,000kmlong aleutian trench and in the arc of active. Sep 27, 2016 a bathymetric features of the aleutian arc system. What does the arc suggest about its surrounding geographic region.
We present a reevaluation of the seismological properties of the aleutian tsunami earthquake of 1946 april 1, characterized by a deceptively low co. Eastern aleutian volcanic arc digital model version 1. Threedimensional inversion of regional p and s arrival. Waves can have various effects on volcanic coasts, depending on the type of volcanic sediment present at the shore. 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. This animation discusses the range of tectonic activity from megathrust earthquakes to accretion of geologic. Tsunami recurrence in the eastern alaskaaleutian arc. Tectonic tremor and associated slow slip events represent a newly discovered part of the earthquake cycle.
Apr 17, 2019 an assessment of climate change vulnerability for important bird areas in the bering sea and aleutian arc. Of the more than 325,000 structure forming invertebrate organisms. Aleutian islands map southwestern alaska, alaska mapcarta. 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. World plate boundary map with location of eastern aleutian arc. The timing of aleutian arc inception and nascent magmatic.
Volcanoes have influenced the aleutian arc in two ways. 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. The source code for this program is provided in the ftp area of this report. Shoreline erodability along volcanic coasts ranges from very erodible for ash and unconsolidated sediment to very resistant for basalt. Follow these stepbystep directions to clip data frames in arcgis to create. Use arcmap, arccatalog, arcglobe, and arcscenethe traditional arcgis desktop applicationsto create maps, perform spatial analysis, manage geographic data, and share your results.
The solomons, papua, madagascar, the aleutians, and burma, july 1942may. 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. 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. 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. Focal mechanisms are from the harvard cmt catalog, based on events with m w 6. 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%. Of these, 36 are indicated as haying been active since 1760.
Esri gis products arcgis mapping software for desktop, saas. The map shows an island arc in alaska named the aleutian. Figure 2 world plate boundary map with location of the eastern aleutian arc modified from figure in this dynamic earth with permission. The aleutian arc is a unique place to carry out such research. Switching to arcgis pro from arcmap is an invaluable resource for those looking to migrate from arcmap to arcgis pro.
To obtain a more detailed view of a specific mosaic move the cursor over the mosaic area and click to select. Threedimensional inversion of regional p and s arrival times. Tracking alongarc sediment inputs to the aleutian arc. 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. The collision generates an arc of active volcanoes, small to large earthquakes and on occasion. First, they have been constructive agents, creating islands as eruption after eruption has vented rock and ash. 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. 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 software is available to download from the publisher site. The eastern aleutian arc shows local lowvelocity anomalies, which may reflect rollback flows in the mantle wedge over the subducting pacific plate. Bathymetric map of the aleutian trench and bering sea. 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. Geological survey, one for the chukchi sea and arctic ocean, and one for the aleutian trench and bering sea. Below is an index map of the gloria imagery available for the u. This data set contains point locations of geothermally active areas as compiled by motyka et al. Alaskas subduction zone and potential for large tsunamis. The map shows an island arc in alaska named the aleutian arc.
Students learn basic terms for land and sea features of the aleutian arc in. At depths of 100 and 150 km, the pvelocity anomalies under the aleutian arc change their structure radically. The primary data base consists of hypocenters of earthquakes for the period 19651975, carefully. Alaskan tectonics are dominated by the pacificnorth american plates. The alaska series e projection was developed in 1972 by the usgs to publish a map of alaska at 1. An assessment of climate change vulnerability for important. Shoreline erodability along volcanic coasts ranges from very erodible for ash and. The aleutian islands are a chain of island to the west of southwestern alaska.
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. 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. 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. Since the last revisions to the map for alaska in 2007. This data set contains point locations of active volcanoes as compiled by motyka et al.
This projection is appropriate for mapping alaska, the aleutian islands, and the bering sea region only. 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. 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. The earths tectonic plates figure 2 produce spectacular topography, active volcanoes, and powerful earthquakes when they collide at convergent boundaries. Because of the variety of geothermal activity present at any given site, each site has been mapped. 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. Earthquakes, plate subduction, and stress reversals in the. 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.
The red line in the bathymetric map indicates the location of the bathymetry profile shown in fig. Tracking alongarc sediment inputs to the aleutian arc using. Atep 20062008 uaf geophysical institute a53 aleutian arc. The newest addition to the arcgis desktop product line integrates your gis workflows in a single elegant application. The raw gloria data were processed and digitally mosaicked to produce 31 digital mosaics of a 3degree by 2. Rather than teach pro from the start, this book focuses on the difference between pro. The aleutian islands may have among the most abundant and diverse deepsea, coldwater, coral and sponge communities in the world. In january 1997, esri decided to revamp its gis software platform, creating a single integrated software architecture. Aftershock zones and dates of major earthquakes are indicated.
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 collision generates an arc of active volcanoes, small to large earthquakes and on occasion small to large tsunamis. 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. Eightynine volcanoes with eruptive phases in the quaternary are mapped as points centered in the active caldera. Understanding the genesis of plutonic rocksthose that crystallized from slowlycooling magmais the key to knowing more about continental crust formation. 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. The national seismic hazard maps developed by the usgs show the spatial probability of peak earthquakedriven ground motion levels. Volcanic and tectonic deformation on unimak island in the.
Singleevent firstmotion solutions are determined from these rays for 31 slab events. 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. Clip the data frame to make your map polished, professional esri. Alaska ifsar acquisition supports the broader national 3d elevation program. Location map and tectonic setting of the central aleutian arc and unimak island. The alaska mapping initiative supports acquisition of new topographic map. It consists of a number of active and dormant volcanoes that have formed as a result of subduction along the aleutian trench. Researcher studies volcanic gases in remote areas of world. The pacific plate subducts beneath the north american plate along the aleutian trench of alaska. Projectionspecific parameters are set by the software. The aleutian arc data system is an interactive database providing access to chemical, petrographic and spatial data concerning the geology of the aleutian islands. Continental crust layer of the aleutian arc 3d model. Map of the aleutian islands and the alaska peninsula, showing.
Coats abstract at least 76 major volcanoes, active and extinct, have been recognized in the aleutian arc, extending from buldir. The megathrust boundary between the plates results in both the 4,000kmlong aleutian trench and in the arc of active volcanoes that lie subparallel to the trench. Aleutian arc volcanism is the result of the active subduction of the pacific plate beneath the north american plate. In 1946 and 1964, large tsunamis were generated from magnitude 8 earthquakes near unimak island. Jun 07, 2016 the pacific plate subducts beneath the north american plate along the aleutian trench of alaska. After the map was digitized and projected into geographic, the digital chart of the world coastline 1. The timing of aleutian arc inception and nascent magmatic evolution.145 592 1454 981 1506 1053 1142 471 135 1317 506 1282 1568 1288 234 481 210 1146 818 540 587 393 742 1358 1016 984 324 1278 1388 581 1043 1523 81 336 347 660 329 564 725 974 45 293 644 392 689 106 1062