Brent King
GEOG-1700-042
E-Portfolio assignment
6/23/2013
Part 1: Tracking Earthquakes
1. Location: Off the coast of Nayarit, Mexico
Magnitude: 4.8
Depth: 10.10k (6.28 mi)
Time: Saturday, June 22 2013, 6:46:37 P.M.
Type of tectonic boundary: There are three different zones that are working in this area.
They are Oceanic convergence, Oceanic transform, Oceanic spreading, and a Continental
to Oceanic subduction zone.
This earthquake took place along these plate boundaries due to the amount of stress
caused by so many boundaries working against each other. Looking at all the tectonic
plates in this area it is no surprise that so many earthquakes take place in Central
America. The area is trying to pull its self apart in many different directions.2
2. Location: Offshore Guatemala
Magnitude: 4.2
Depth: 35km (21.75 mi)
Time: Friday, June 21 2013, 5:05:01 A.M.
Type of tectonic boundary: Oceanic to Continental
All along this subduction zone many earthquake take place. The earthquakes are caused
by the two plates colliding along the oceanic and continental boundaries where the
oceanic plates are being pulled under the continental plate.
3. Location: Guatemala
Magnitude: 4.9
Depth: 244.40km (151.86 mi)
Time: Saturday, June 22 2013, 11:35:32 A.M.
Type of tectonic boundary: Continental Rift
This earthquake took place along a boundary that splits the country of Guatemala in half.
Along with this fault line there is also a oceanic to continental boundary off the coast of
Guatemala.
4. Location: Northern Italy
Magnitude: 5.1
Depth: 10.30km (6.4 mi)
Time: Friday, June 21 2013, 12:33:59 P.M.
Type of tectonic boundary: Intraplate
This earthquake took place in the middle of a continent. The nearest plate boundaries are
370 miles away. The boundary that is the closest to this earthquake is a continental to
continental convergence. The area that this earthquake took place in has some evidence
of ancient volcanic activity. The area also has one the world’s largest active geothermal
areas in Larderello Italy. That can help explain the activity taking place in this area.
Part 2: Identifying Volcanoes
1. Name: Mt Tahual, Guatemala
Type: Cinder Cone
Type of tectonic boundary: Oceanic to Continental, This volcano along with many
others have formed from the two plates colliding creating a subduction zone.
2. Name: Mt. Fuji, Japan
Type: Composite Volcano
Type of tectonic boundary: Continental to Oceanic convergence, Oceanic to Oceanic
convergence, Continental to Continental convergence.
In the area of this volcano and all of the volcanos in Japan there are so many plate
boundaries that are coming and going. With so many boundaries is really make sense
why there is so much activity in the islands of Japan. The place is literally trying to
pull and push itself apart and together all at the same time. One of the reasons that
this volcano is in its location is the subduction zone created by the continental to
oceanic convergence zone.
3. Name: Mt Mauna Loa, Hawaii
Type: Shield Volcano
Type of tectonic boundary: Hot spot
This volcano along with the many other volcanos in the Hawaiian island has been
created by a hot spot in the ocean floor. As the plate moves across this hot spot it has
formed the islands. This island formation is still taking place with volcanos erupting
underwater creating what will someday be a new island. A hot spot is created by the
spreading of the ocean floor creating an area where the crust becomes thinner.
4. Name: Yellowstone, United States
Type: Caldera
Type of tectonic boundary: Hot spot
There are so many caldera volcanos in the world, but I had to use Yellowstone
because it is one of my favorite places to visit. The caldera was created by a very
large volcanic eruption thousands of years ago. The caldera is approximately 50 miles
long and 35 miles wide. It is very fascinating place to go and witness the geothermal
activity that still takes place today.