Category Archives: class

Adobe Software

https://www.adobe.com/cfusion/entitlement/index.cfm?e=cs2_downloads&loc=en

In an enormous act of charity, Adobe has just offered their outdated CS2 suite of products for free. This includes Photoshop and Illustrator. I know a lot of geo students are using illustrator for their projects so this is a great opportunity. CS2 is an older version but it still works great for generating strat columns and doesn’t cost $200; plus, it runs better on slower machines. These all have registration disabled and have full functionality. Now only if they made a decent GIS program!…

They did this a few months ago by accident and disabled downloading immediately, but after an overwhelming number of downloads and support they decided it was good for their business model to get people hooked on their products. The software is widely pirated already so they would rather have people using legitimate copies instead of downloading sketchy pirated copies.

Here is the link!

Hookton Slough Coring

Tom Leroy and I went to my old coring site 01-BR-05 to make sure it was usable as a field trip stop for my class. We will be going here this coming Wednesday. Thanks Tom for helping me out.

I will write more about these cores and what our interpretations are after the field trip. I want the class to come up with their own interpretations. I have a few photos of the core we collected today.

This is an overall view of the 3rd core section down. This core samples sediment of approximately 1 meter in length. This core sampled sediment from approximately 1.8 to 2.8 meters. Up is to the left. The base of the core includes blue-gray silty-clay, overlain by an organic rich brown muddy peat, overlain by a clean mud and then a series of muddy sand and sandy mud layers, which is finally overlain by some more mud. Some of the mud has darker grey layers.

Here is an overall view of the middle of the core.01-BR-05

Here is a “zoom in” of the middle of the core.01-BR-05

Here is a map of the regional tectonics.01-BR-05

Alaska Earthquakes

The 1964 Great Alaska Earthquake occurred on Good Friday, March 27th. It and rocked the state with strong ground shaking for 4.5 minutes. At magnitude 9.2, it was the second largest quake ever recorded by seismometers.

This animation shows the underlying causes of that earthquake, and tells how research done on the ground deformation contributed to confirmation of early theories of plate tectonics.

Animation & graphics by Jenda Johnson, geologist
Directed by Robert F. Butler, University of Portland
U.S. Geological Survey consultants: Robert C. Witter, Alaska Science Center Peter J. Haeussler, Alaska Science Center
Narrated by Roger Groom, Mount Tabor Middle School

Maps from Google Earth. Video from US Army Corps of Engineers. Tsunami animation from National Oceanic & Atmospheric Administration (NOAA). Photographs from US Geological Survey.

Errata: 1) Fourth Ave., not Fourth St. 2) After 2min48sec the epicenter was shifted N. Should be ESE of that, closer to Prince William Sound. Apologies from animator.

Youtube Source IRIS

WMV file for downloading.

EQ title page

Mw 5.0 Trinidad 2013.10.11

All right! That was exciting and a little bit scary. Most all earthquakes scare me because I recognize they might get bigger or trigger a bigger one.

This earthquake is most likely on a northeast striking strike-slip fault in the downgoing Gorda plate. The GP is caught in a vice between the older and stronger North America and Pacific plates.

Here is the USGS page: http://earthquake.usgs.gov/earthquakes/eventpage/nc72086051#summary

Here is the moment tensor
Mw = 5 Trinidad Moment Tensor

Here is the seismogrpaph at HSU (photo credit Lori Dengler)
Mw = 5 Trinidad Moment Tensor

Mw = 5 Trinidad Map

Here is a map I made in google earth showing historic earthquakes. Note the larger gray circle to the northeast of today’s earthquake. That is the 1980 Mw = 7.2 earthquake that caused extensive damage in Humboldt County (knocking the bridge partly down on hwy 101 near CR). Today’s earthquake appears to be along the same fault system that ruptured in 1980:

Mw = 5 Trinidad Map

Here is the seismogrpaph at Jacoby Creek (data credit Lori Dengler). The vertical lines are six seconds apart.
Mw = 5 Trinidad Moment Tensor

Here is a map that Chris Rollins used in his 2010 paper. It shows historic seismicity in this region, including the 1980 swarm.
Mw = 5 Trinidad Rollins

Here is a map that I made in google earth that shows the shaking intensity (Modified Mercalli Intensity Scale).
Mw = 5 Trinidad Rollins

Here is a map that I made in google earth that shows the % Peak Ground Acceleration (% of g, where g is defined as 9.8 m/s^2).
Mw = 5 Trinidad Rollins

These are the models for tectonic deformation within the Gorda plate as presented by Jason Chaytor in 2004.
Mw = 5 Trinidad Chaytor

Here is the SCEC page: http://www.data.scec.org/recenteqs/Quakes/nc72086051.html

Here are the seismologic information:
Mw = 5 Trinidad NCSS Seismo

Here is the SCEC map I went to before it showed up on the USGS page. Note that no magnitude had been assigned yet:
Mw = 5 Trinidad Moment Tensor

M7.7 Earthquake in Pakistan

A very large earthquake in Pakistan today!

As a result of collision of the Arabia plate into the Eurasia plate, thrust faults formed in Pakistan. This collision zone is the same basic convergence region that extends from Java/Sumatra, up through Burma, across India (creating the Himalaya), through the middle east, into the Mediterranean creating the Alps.
Here is the moment tensor for this earthquake, showing the oblique mechanism.
M=7.7 Pakistan Moment Tensor

Here is a map with the epicenter plotted in google earth.
M=7.7 Pakistan

Here is a map with the Modified Mercalli Intensity Contours plotted in google earth.
M=7.7 Pakistan

Here is a map with the MMI intensity (USGS shakemap color overlay) and Peak Ground Acceleration Contours plotted in google earth.
M=7.7 Pakistan

Here is the USGS page: http://earthquake.usgs.gov/earthquakes/eventpage/usb000jyiv#summary

Here is the USGS map for the region:
http://earthjay.com/earthquakes/20130924_pakistan/middleeast_tsum.jpg

Here is the USGS page for the loss estimates below: http://earthquake.usgs.gov/earthquakes/eventpage/usb000jyiv#pager

Here is the estimate of fatalities for this earthquake:
http://earthjay.com/earthquakes/20130924_pakistan/alertfatal.jpg

Here is the estimate of economic loss for this earthquake:
http://earthjay.com/earthquakes/20130924_pakistan/alertecon.jpg

Here is the estimate of “exposure” for this earthquake:
http://earthjay.com/earthquakes/20130924_pakistan/pakistan_78_table_population_exposure_20130924_0850.PNG

Fall 2013 Geosciences Courses – College of the Redwoods, Eureka

There are several Earth Science courses taught at College of the Redwoods this coming Fall Semester. These are listed below. Please visit http://www.redwoods.edu/admissions/guide/ to register for any of these classes.

Environmental Science 15 Introduction to Energy 3 units An introductory study of humanity’s past and present use of available energy resources and an examination of potential future directions in energy use. Students will learn about the physical principles of energy resources and consider issues of environmental impact, economics, and sustainability.

Geology 1 Physical Geology 4 units An introductory study of physical geology including earth processes, materials, and changes in these materials through geologic time. Students will study minerals and rocks in the lab and the field, and will explore principles of mineral and rock formation, landform development, plate tectonics, volcanism, folding and faulting, and related topics.

Geology 15 Introduction to Earthquakes and Geologic Hazards 3 units An investigation of geologic and plate-tectonic processes and their relationships to faults, earthquake activity, mountain building, volcanism, landform development, and natural disasters. The course explores plate interactions and the connection to historic geologic disasters including earthquakes, tsunami, and volcanic eruptions. Students will learn about hazard prediction, preparedness, and societal responses to living within a dynamic geologic environment. Here is the website for this course.

Oceanography 10 Introduction to Oceanography 3 units An introduction to the Earth’s ocean including marine environments, geology, plate tectonics, fundamental chemical and physical properties of seawater, atmospheric-oceanic relationships, oceanic circulation, coastal environments and biological productivity. (linked to Oceanography 11)

Oceanography 11 Lab in Oceanography 1 units An exploration of the conceptual material presented in OCEAN-10. Students will acquire practical laboratory and field experience using oceanographic skills, tests, and procedures. Laboratory exercises focus on chart reading, measurements of seafloor movement, seawater chemistry, wave celerity, and microscopic analysis. Field experience includes examination of coastal geology, wave and beach processes, habitats and marine organisms. (linked to Oceanography 10)

Fall 2013 College of the Redwoods GEOL 15 – Introduction to Earthquakes and Geologic Hazards

Register NOW for this Mon-Wed (14:50-16:14) course at www.redwoods.edu.

An investigation of geologic and plate-tectonic processes and their relationships to faults, earthquake activity, mountain building, volcanism, landform development, and natural disasters. The course explores plate interactions and the connection to historic geologic disasters including earthquakes, tsunami, and volcanic eruptions. Students will learn about hazard prediction, preparedness, and societal responses to living within a dynamic geologic environment.

Geol 15 poster