County – the Portland Hills fault zone beneath the Portland metropolitan area, the Gales Creek fault zone along the east flank of the Coast Range, and the Mount Angel fault zone in the northern Willamette Valley. Jump to navigation Jump to search. Scott, an inactive Quaternary volcano, and the Oatfield Fault on the west slope of the Portland Hills extending southeast to Lake Oswego and Gladstone (Figure 6-14).

During the Pleistocene, the interior of British Columbia was covered by a vast ice cap, like Greenland today, and glaciers had advanced southward into northern Washington, damming the Columbia River and its tributaries at Spokane to form a huge body of freshwater, Glacial Lake Missoula, that extended across Idaho into Montana, almost to the Continental Divide. For a better experience, please. The Portland Hills Fault: uncovering a hidden fault in Portland, Oregon using high-resolution geophysical methods.

Do I have room in my yard to put up a tent and should I plan to stay at my home but be in some other kind of shelter like a tent or an outdoor building?".

The Portland Hills fault zone is the largest shallow fault that cuts beneath Portland, Oregon. Click here for a summary of impacts by city, Rare Portland Hills quake could cause even more damage. In addition, excavations for an expansion of the Oregon Convention Center showed Missoula flood deposits that are cut by sand dikes, generally considered to be formed by liquefaction, diagnostic for an earthquake origin. The Portland Hills fault zone lies just east of Washington County. Hansen said people should have two weeks of food, water, first aid supplies and anything else they would need if the normal city services such as water and sewer were shut off.
The Portland Hills Fault Zone. Recently acquired shallow seismic-reflection and ground-penetrating radar data (Hemphill-Haley and others, 2000 #5138; 2001 #5056; Pratt and others, 2001 #5136) across the mapped trace of the Portland Hills fault south of Ross Island suggest possible deformation of unconformities and sediments associated with the latest Pleistocene Missoula floods. Madin, pers.

The crest of the Portland Hills is defined by the northwest-striking Portland Hills anticline. magnitude 5.6 earthquake with an epicenter about 30 miles southeast of Washington County. 6, p. 109-118. Then somebody noticed a retaining-wall excavation at Rowe Middle School, not far from North Clackamas Park. She said. your own Pins on Pinterest The earthquake was centred 2 kilometres (1.2 mi) west of the town of Lyttelton, and 10 kilometres (6 mi) south-east of the centre of Christchurch, New Zealand's second-most populous city.

The Portland Hills fault may be responsible for the linear, 250-m-high escarpment on Miocene rocks of the Columbia River Basalt Group along the northeastern margin of the Portland Hills. So, like the Seattle Fault, the Portland Hills Fault is a broad zone of faulting rather than a single fault. of magnitudes as high as 6.8 to 7.2. The geophysical images are critical to characterizing the structural style within the zone of deformation, and when integrated with a paleoseismic trench, can accurately record the seismic history of a region with little surface geologic exposure. The Portland Hills fault was not shown on early geologic maps of the region (Piper, 1942 #4064; Trimble, 1963 #4062; Hart and Newcomb, 1965 #4063), despite its prominent geomorphic expression along the linear northeast margin of the Tualatin Mountains, which are locally known as the Portland Hills. The Portland Hills Fault runs from the northern edge of Forest Park, goes along the foot of Portland’s West Hills and beneath Portland State University, crosses the Willamette River and heads southeast to Milwaukie. The best-studied earthquake struck on November 5, 1962, with an epicenter near Vancouver and a magnitude of 5.2 to 5.5. Unruh and others (1994 #3597) conducted limited aerial and field reconnaissance along the northeastern margin of the Portland Hills, and found no direct evidence of faulting in Quaternary deposits. Discover (and save!) Could they somehow be related to the massive amount of water that repeatedly covered the area in the latest Pleistocene? that trend roughly northwest to southeast and are about two miles apart – the Oatfield fault, which runs along There is a 10-12 percent chance the earthquake will be a 9.0 or higher. Lower-intensity earthquakes were recorded in Portland on February 3, 1892, December 29, 1941, and December 15, 1953. These distinctive deposits are rhythmically bedded, with each bed deposited by one of the catastrophic Missoula floods in the latest Pleistocene. However, could these dikes have been produced by a subduction-zone earthquake? Unruh and others (1994 #3597) cite the folding of basin-fill sediments interbedded with Boring Lava on the west flank of the Portland Hills as evidence of Quaternary movement on their hypothesized thrust fault underlying the Portland Hills anticline; Boring Lava rocks are Pliocene and Pleistocene in age (Conrey and others, 1996 #4025; Fleck and others, 2002 #5149). The translate tool no longer supports Internet Explorer and older browsers. No fault scarps on Quaternary surficial deposits have been described, but Balsillie and Benson (1971 #4005) described anomalous benches, triangular facets, wineglass (oversteepened) valleys, and knickpoints on tributary streams as evidence of recent movement. 9.0 km depth. The Oatfield Fault runs west of Skyline Road from Sylvan Hill to Germantown Road through Bonny Slope. A gravity gradient coincides with the Portland Hills fault (McPhee and others, 2014 #7371). "A Cascadia earthquake will happen," said the lead investigator.

1400 SW Walnut St, Hillsboro, OR 97123-7620. Washington County. Balsillie and Benson (1971 #4005) apparently were the first to use the name "Portland Hills fault" in print, in their discussion of this fault. Portland; and the East Bank fault, which runs along the east bank of the Willamette River. Legal. In this excavation, the Missoula flood deposits are clearly folded. Due to the size and location of these mega earthquakes, Oregon’s coast gets …
Portland Hills is a question mark as to whether it will happen at all. "Accurate estimates of injuries and people in need of shelter helps us plan to care for injured people, and to meet the needs of people whose houses or apartments won't be safe to live in," he said.

"How well we prepare will make all the difference in how well we bounce back.". The Oregon Department of Geology and Mineral Industries (DOGAMI) conducted the study of a 9.0 magnitude earthquake's potential impacts on Clackamas, Multnomah and Washington counties in order to estimate the worst-case scenario. The northwest-striking Portland Hills fault forms the northeastern margin of the Tualatin Mountains and the southwestern margin of the Portland basin; this basin may be a right-lateral pull-apart basin in the forearc of the Cascadia subduction zone (Beeson and others, 1985 #4022; Beeson and others, 1989 #4023; Yelin and Patton, 1991 #4020; Blakely and others, 1995 #4021; Blakely and others, 2000 #4333), or a piggyback synclinal basin formed between antiformal uplifts of the Portland fold belt (Unruh and others, 1994 #3597; Unruh and others, 1994 #4007). The thundering torrents carved out the Grand Coulee and Dry Falls and deposited giant sandbars on the Columbia River below Wenatchee, so large that they can be seen from space. Satellite images of the Portland metropolitan area show the effects of these giant floods, scouring out the bases of Pleistocene volcanoes and carving canyons through the basalt mountains, one now occupied by Lake Oswego, a Portland suburb (Figure 6-11). Partly this is an accident of early settlement of the Portland Basin. The research included updated building and population data, current earthquake science, and new mapping and modeling techniques that give a clearer picture of potential impacts than older studies did, according to lead investigator John Bauer. (intensity IX) in the Portland Hills, to severe (intensity VIII) in Beaverton and Tigard, to very strong (intensity VII) of unreinforced masonry – damages totaled $30 million. The resulting iceberg-strewn deluge, lasting at least a week, drained Lake Missoula, briefly carrying more water than all the streams on Earth do today. The Portland Hills, which stand about 1,onO feet higher than the PORTLAND, Ore. - A new study shows a Cascadia Subduction Zone earthquake could injure 27,000 people, displace 85,000, kill 1,400 and cause $37 billion in damage to buildings in the Portland metro area alone. The report also breaks out by city the number of people who will need shelter, suffer injuries or die. Geophysical studies by Rick Blakely and his colleagues at the USGS revealed two additional faults parallel to the Portland Hills Fault, the East Bank Fault following the east side of the Willamette River to Mt. The late Marvin Beeson of Portland State University described the Portland Hills structure and fault, which is more or less parallel to the St. Helens Seismic Zone to the north and the Mount Angel Fault to the south, both suspected of being right-lateral strike-slip faults. "Do I have friends and family who live in homes that were built more recently that are less likely to be damaged in an earthquake? The limited geologic information stems from a surface topography that has not maintained a cumulative geologic record of faulting, in part, due to rapid erosion and deposition from late Pleistocene catastrophic flood events and a possible strike-slip component of the faults.

M 7.1 Scenario Earthquake - Portland Hills fault. The Portland Hills fault was not shown on early geologic maps of the region (Piper, 1942 #4064; Trimble, 1963 #4062; Hart and Newcomb, 1965 #4063), despite its prominent geomorphic expression along the linear northeast margin of the Tualatin Mountains, which are locally known as the Portland Hills.

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