One of what should be an occasional series of posts on American iconic places, natural features, sights to see, etc. For studies of U.S. history and U.S. geography, each of these posts covers subjects an educated American should know. What is the value of these icons? Individually and collectively, our preservation of them may do nothing at all for the defense of our nation. But individually and collectively, they help make our nation worth defending.
This is a less-than-10-minute video you can insert into class as a bell ringer, or at the end of a class, or as part of a study of geologic formations, or in any of a number of other ways. Yosemite Nature Notes provides glorious pictures and good information about Yosemite National Park — this video explains the modern incarnation of Half Dome, an enormous chunk of granite that captures the imagination of every living, breathing soul who ever sees it.
Potential questions for class discussion:
Have you put climbing Half Dome on your bucket list yet? Why not?
Is it really wilderness when so many people go there?
How should the National Park Service, and the Forest Service and Bureau of Land Management, manage these spectacular, completely unique features, both to preserve their wild nature, and allow people to visit them?
What are the federalism issues involved in protecting Half Dome, or any grand feature, like the Great Smokey Mountains, Great Dismal Swamp, Big Bend, Yellowstone Falls, or Lincoln Memorial?
Steve Schafersman, now president of Texas Citizens for Science, played the yeoman then:
Description of the program:
Did humans coexist with dinosaurs? The tracks tell the tale. Dr. John R. Cole, Dr. Steven Schafersman, Dr. Laurie Godfrey, Dr. Ronnie Hastings, Lee Mansfield, and other scientists examine the claims and the evidence. Air date: 1983.
James is home for the weekend, then back to Wisconsin on Sunday for a summer of physics beyond my current understanding. He flew home to wish bon voyage to Kenny, who is off to Crete to learn how to teach English, and then (we hope) to find a position teaching English to non-English speakers somewhere in Europe.
I wondered: What about that volcano erupting in Iceland?
Little worry for the trip over, this weekend. Longer term?
So I turned to the Smithsonian to find a volcano expert, and came up with this video of Smithsonian Geologist Liz Cottrell who explains where the eruption of Eyjafjallajökull fits in history, and maybe some — with a lesson in how to pronounce Eyjafjallajökull’s name.
So:
Can teachers figure out how to use this in geography, and in world history? (Science teachers, you’re on your own.)
Life is a gamble if you live close to a volcano, and sometimes when just happen to be downwind.
In the past couple of hundred years, maybe volcanoes worldwide have been unusually quiet.
As to size of eruptions and the damage potential: We ain’t seen nothin’ recently!
Here’s another opportunity to put real, cutting edge technology in your classroom. In fact, your kids could probably invent all sorts of new uses for it.
Have you even heard of this stuff? Can you use it, live, with the equipment you’ve got?
Blaise Aguera y Arcas of MicroSoft demonstrated augmented-reality maps using the power of Bing maps, Flickr, Worldwide Telescope, Video overlays and Photosynth, to an appreciative and wowed audience at TEDS:
My prediction: One more advance in computer technology that classrooms will not see in a timely or useful manner.
But have you figured out how to use this stuff in your geography, history, economics or government classes? Please tell us about it in comments. Give examples and links, please.
A 7.2 magnitude earthquake has hit the Mexican peninsula of Baja California, killing at least one person and causing tremors as far away as Nevada.
The quake struck at 1540 (2240 GMT), 26km (16 miles) south-west of Guadalupe Victoria in Baja California, at a depth of 32km, said the US Geological Survey.
Some people are still trapped in their homes in the city of Mexicali, where a state of emergency has been declared.
It was the worst quake to hit the region for many years, officials said.
The US Geological Survey said some 20 million people felt tremors from the largest quake to hit the area since 1992.
My students with Mexico connections tend to come from farther east, and higher in the mountains — I don’t think I have a single student who visits Baja California on breaks. But the news will prompt questions from them tomorrow.
A magnitude 7.2 earthquake occurred at 3:40:40 p.m. (local time at the epicenter) on Sunday, 4 April 2010 in Baja California, approximately 75 km south of the Mexico-USA border. The earthquake occurred at shallow depth (approximately 10 km) along the boundary zone between the North American and Pacific plates. Since earthquakes have been recorded instrumentally, only two similar sized earthquakes have been recorded in the area. The first was the 1892 earthquake estimated at magnitude 7.0-7.2 along the Laguna Salada fault just south of the USA-Mexico border. The second was the 1940 Imperial Valley magnitude 6.9 earthquake which occurred in southernmost California. Today’s event is located nearly in line with these earthquakes along the plate boundary, but is situated farther to the south. There are several active faults in the vicinity of today’s earthquake, and the particular fault that generated this quake has not yet been determined. Faulting is complex in this region, because the plate boundary is transitional between the ridge-transform system in the Gulf of California and the continental transform system in the Salton Trough. Most of the major active faults are right-lateral strike-slip faults with a northwest-southeast orientation, similar in style to the San Andreas fault to the north. Other faults in the vicinity with the same orientation include the Cerro Prieto fault and the Laguna Salada fault.
USGS "shake map" for the April 4 7.2 quake near Mexicali, Mexico - Click to go to USGS site
What other questions can we anticipate? Somebody will ask whether this quake is related to the Haiti and Chilean quakes (probably not closely related). Somebody will wonder about the Pacific Ring of Fire, and this quake’s relation to volcanoes and general earthquake activity around the Pacific (high relationship). Someone will want to know about quakes in your area. Is this the precursor to “the Big One?”
The USGS site is a good place to start on all of those questions.
Three earthquakes in a week do not make a swarm. Interesting that the last post on an earthquake in Oklahoma drew earthquake conspiratorialists and “skeptics.” Too many people distrust all science and sources of information these days.
Here’s the dirt on Oklahoma’s shaking in the last week, from the U.S. Geological Service site:
Earthquake List for Map Centered at 36°N, 97°W
Update time = Sat Mar 6 18:00:02 UTC 2010
Here are the earthquakes in the Map Centered at 36°N, 97°W area, most recent at the top.
(Some early events may be obscured by later ones.)
Click on the underlined portion of an earthquake record in the list below for more information.
This isn’t unusual at all, of course. I think many people just don’t understand that earthquakes happen all the time, but they usually get crowded out of the newspaper because no one really cares.
Laugh, and the world laughs with you;
Weep, and you weep alone.
For the sad old earth must borrow it’s mirth,
But has trouble enough of its own.
Sing, and the hills will answer;
Sigh, it is lost on the air.
The echoes bound to a joyful sound,
But shrink from voicing care.
Coastal-Change and Glaciological Map of the Palmer Land Area, Antarctica: 1947—2009
By Jane G. Ferrigno,1 Alison J. Cook,2 Amy M. Mathie,3 Richard S. Williams, Jr.,4 Charles Swithinbank,5 Kevin M. Foley,1 Adrian J. Fox,2 Janet W. Thomson,6 and Jörn Sievers
Introduction
Cover of USGS publication, Coastal-Change and Glaciological Map of the Palmer Land Area, Antarctica: 1947—2009
Reduction in the area and volume of the two polar ice sheets is intricately linked to changes in global climate, and the resulting rise in sea level could severely impact the densely populated coastal regions on Earth. Antarctica is Earth’s largest reservoir of glacial ice. Melting of the West Antarctic part alone of the Antarctic ice sheet would cause a sea-level rise of approximately 6 meters (m), and the potential sea-level rise after melting of the entire Antarctic ice sheet is estimated to be 65 m (Lythe and others, 2001) to 73 m (Williams and Hall, 1993). The mass balance (the net volumetric gain or loss) of the Antarctic ice sheet is highly complex, responding differently to different climatic and other conditions in each region (Vaughan, 2005). In a review paper, Rignot and Thomas (2002) concluded that the West Antarctic ice sheet is probably becoming thinner overall; although it is known to be thickening in the west, it is thinning in the north. The mass balance of the East Antarctic ice sheet is thought by Davis and others (2005) to be positive on the basis of the change in satellite-altimetry measurements made between 1992 and 2003.
Measurement of changes in area and mass balance of the Antarctic ice sheet was given a very high priority in recommendations by the Polar Research Board of the National Research Council (1986), in subsequent recommendations by the Scientific Committee on Antarctic Research (SCAR) (1989, 1993), and by the National Science Foundation’s (1990) Division of Polar Programs. On the basis of these recommendations, the U.S. Geological Survey (USGS) decided that the archive of early 1970s Landsat 1, 2, and 3 Multispectral Scanner (MSS) images of Antarctica and the subsequent repeat coverage made possible with Landsat and other satellite images provided an excellent means of documenting changes in the cryospheric coastline of Antarctica (Ferrigno and Gould, 1987). The availability of this information provided the impetus for carrying out a comprehensive analysis of the glaciological features of the coastal regions and changes in ice fronts of Antarctica (Swithinbank, 1988; Williams and Ferrigno, 1988). The project was later modified to include Landsat 4 and 5 MSS and Thematic Mapper (TM) images (and in some areas Landsat 7 Enhanced Thematic Mapper Plus (ETM+) images), RADARSAT images, aerial photography, and other data where available, to compare changes that occurred during a 20- to 25- or 30-year time interval (or longer where data were available, as in the Antarctic Peninsula). The results of the analysis are being used to produce a digital database and a series of USGS Geologic Investigations Series Maps (I-2600) (Williams and others, 1995; Swithinbank and others, 2003a,b, 2004; Ferrigno and others, 2002, 2005, 2006, 2007, 2008, and in press; and Williams and Ferrigno, 2005) (available online at http://www.glaciers.er.usgs.gov).
The paper version of this map is available for purchase from the USGS Store.
What’s the condition of glaciers in Antarctica? Now you can look it up.
The most noticeable and dramatic changes that can be seen on the Palmer Land area map are the retreat of George VI, Wilkins, Bach, and northern Stange Ice Shelves. The northern ice front of George VI Ice Shelf was at its farthest extent during our period of observation between 1966 and 1974. It retreated, losing 906 km2 between 1974 and 1992 and 87 km2 between 1992 and 1995. After 1995, it retreated an additional 1 km to more than 6 km by 2001. The southern George VI ice front retreated considerably from 1947 to the late 1960s. From the late 1960s to 1973, there was additional substantial retreat, the greatest during the period of measurements. From 1973 to 2001, there was overall noticeable retreat.
Wilkins Ice Shelf had four ice fronts up till 2009; all retreated during the time period of our study, but Wilkins “a” and “b” have had the most dramatic change, including extensive calving in 2009 that eliminated ice front “b” and threatened the future of the ice shelf. During the period of observation, the Bach Ice Shelf front maintained a fairly consistent profile, and advanced or retreated at the same time along the entire ice front. The overall trend of Bach Ice Shelf is retreat. On the northern Stange Ice Shelf during the period of observation, the 1947, 1965–66, 1973, and 1986 ice fronts were more advanced, and the 1997 and 2001 ice fronts were more in retreat. However, the earlier data are less accurate geographically, and it is difficult to quantitatively analyze them. The later satellite images are more accurate, and it is possible to measure overall advance from 1986 to 1989, then retreat from 1989 to 1997 and from1997 to 2001; the net result was retreat.
The three coastal-change and glaciological maps of the Antarctic Peninsula (I–2600–A, –B, and –C) portray one of the most rapidly changing areas on Earth. The changes exhibited in the region are widely regarded as among the most profound and unambiguous examples of the effects of global warming yet seen on the planet.
Resources:
.pdf Map of the Palmer Land Area — if you have the printer, this is suitable for a detailed, poster-sized map of Antarctica and its ice
These .pdfs are suitable for papers sizes roughtly 8.5 by 11 inches in the U.S. — but they probably would scale up nicely for poster-size maps, too. The maps are in color, and in German.
Spread the word; friends don't allow friends to repeat history.
That’s probably not entirely accurate, let’s rephrase: Hawaii didn’t get a significant tsunami from the Chilean quake. The Hawaiians didn’t miss it at all. Hawaiians moved to higher ground. They prepared for disaster. Then the disaster didn’t occur.
That’s good news, especially since there remains disaster in Chile to worry about.
Earthquake map from USGS, showing location of the Chile quake 2-27-2010 - click on map to go to interactive version at USGS site
A horrible, devastating earthquake hit Chile last night, on the west coast of South America. Scientists at the Pacific Tsunami Warning Center fear it may have triggered a tsunami that will hit Hawaii today (an AP story says at 5:19 p.m. Eastern; that’s 4:19 p.m. Central, and just after 11:00 a.m. in Honolulu, Hawaii, Hawaiian-Aleutian Standard Time (HAST).
It planned to sound civil defense sirens across the island state at 6 a.m. local time (11 a.m. EST) after the Pacific Tsunami Warning Center said a tsunami was generated that could cause damage along the coasts of all the Hawaiian islands,
“Get off the shore line. We are closing all the beaches and telling people to drive out of the area,” said John Cummings, Oahu Civil Defense spokesman.
Buses will patrol beaches and take people to parks in a voluntary process expected to last five hours.
More than an hour before sirens were due to sound lines of cars snaked for blocks from gas stations in Honolulu.
“Urgent action should be taken to protect lives and property,” the Warning Center said in a bulletin. “All shores are at risk no matter which direction they face.”
* * * * * * * *
The warning follows a huge earthquake in Chile that killed at least 82 people and triggered tsunamis up and down the coast of the earthquake-prone country.
The center estimates the first tsunami, which is a series of several waves in succession, will hit Hawaii at 11:19 a.m. Hawaii time (4:19 p.m. EST) in the town of Hilo on the Big Island of Hawaii, with waves in Honolulu at 11:52 a.m.
Sardina said the Hawaiian islands could expect waves of six feet (two meters) in some places. Other estimates have been higher but he could not confirm those were likely.
Plate tectonics at work — the Pacific plate pushing underneath South America. The epicenter was 22 miles deep. We get a glimpse into how geologists and others work with a report from the Times of London:
Several big aftershocks later hit the south-central region, including ones measuring 6.9, 6.2 and 5.6.
The earthquake was caused by the floor of the Pacific being pushed below South American land mass.
This sudden jerking of the sea-floor displaced water and triggered a tsunami, which is now crossing the ocean at a speed of a jet plane.
The Pacific Tsunami Warning Center issued a warning for Chile and Peru, and a less-urgent tsunami watch for Ecuador, Colombia, Panama, Costa Rica and Antarctica.
A spokesman said: “Sea level readings indicate a tsunami was generated.
Will a potential disaster in human lives be averted?
Isn’t this exactly how science is supposed to work? Will the anti-science yahoos ignore the warnings?
Woo notice: Our dogs were restless last night. I had to get up twice to let them out just to bark with the rest of the dogs in the neighborhood, who all seemed to be going nuts at once. Looking at the news stories, it was just a bit before the big quake hit Chile. It doesn’t make sense to me that dogs so far away from the epicenter would be affected that way.
The 20th century saw a trend of increasing mean temperatures across the Colorado River basin that has continued into theearly 21st century. There is no evidence that this warming trendwill dissipate in the coming decades; many different climatemodel projections point to a warmer future for the ColoradoRiver region.
Modeling results show less consensus regarding future trendsin precipitation. Several hydroclimatic studies project that significant decreases in runoff and streamflow will accompany increasing temperatures. Other studies, however, suggest increasing future flows, highlighting the uncertainty attached to futurerunoff and streamflow projections. Based on analysis of manyrecent climate model simulations, the preponderance of scientificevidence suggests that warmer future temperatures will reducefuture Colorado River streamflow and water supplies. Reducedstreamflow would also contribute to increasing severity, frequency, and duration of future droughts.
Spread the word; friends don't allow friends to repeat history.
As of January 26, 2010 9:00 AM MST there have been 1,360 located earthquakes in the recent Yellowstone National Park swarm. The swarm began January 17, 2010 around 1:00 PM MST about 10 miles (16 km) northwest of the Old Faithful area on the northwestern edge of Yellowstone Caldera. Swarms have occurred in this area several times over the past two decades.
There have been 11 events with a magnitude larger than 3, 101 events of magnitude 2 to 3, and 1248 events with a magnitude less than 2. The largest events so far have been a pair of earthquakes of magnitude 3.7 and 3.8 that occurred after 11 PM MST on January 20, 2010.
The first event of magnitude 3.7 occurred at 11:01 PM MST and was shortly followed by a magnitude 3.8 event at 11:16 PM. Both shocks were located around 9 miles to the southeast of West Yellowstone, MT and about 10 miles to the northwest of Old Faithful, WY. Both events were felt throughout the park and in surrounding communities in Wyoming, Montana, and Idaho.
Ground deformations in the Yellowstone Caldera, from satellite photos, in 2005 - Geology.com image (This isn't really directly related to the earthquake swarm, but it's a cool image.)
Update, March 12, 2011: This post has been mighty popular over the last week. Can someone tell me, in comments, whether this post was linked to by another site? Why the popularity all of a sudden — even before the Japan earthquake and tsunami? Please do!
Spread the word; friends don't allow friends to repeat history.
Or, until that account is unsuspended by the forces supporting Donald Trump: Follow @FillmoreWhite, the account of the Millard Fillmore White House Library
We've been soaking in the Bathtub for several months, long enough that some of the links we've used have gone to the Great Internet in the Sky.
If you find a dead link, please leave a comment to that post, and tell us what link has expired.
Thanks!
Retired teacher of law, economics, history, AP government, psychology and science. Former speechwriter, press guy and legislative aide in U.S. Senate. Former Department of Education. Former airline real estate, telecom towers, Big 6 (that old!) consultant. Lab and field research in air pollution control.
My blog, Millard Fillmore's Bathtub, is a continuing experiment to test how to use blogs to improve and speed up learning processes for students, perhaps by making some of the courses actually interesting. It is a blog for teachers, to see if we can use blogs. It is for people interested in social studies and social studies education, to see if we can learn to get it right. It's a blog for science fans, to promote good science and good science policy. It's a blog for people interested in good government and how to achieve it.
BS in Mass Communication, University of Utah
Graduate study in Rhetoric and Speech Communication, University of Arizona
JD from the National Law Center, George Washington University
Posted by Ed Darrell 
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