Name: _____________________________ Class: _________________ Date: ___________
Hayward Recurrence Student Worksheet Previous Hayward ruptures at Tyson's Lagoon (near Fremont BART station) |
|||
Preferred Event Date |
Possible Date Range |
Time Between Events |
|
|
1868 |
October 21, 1868 |
148 |
1720 |
1650 - 1790 A.D. |
85 |
|
1635 |
1530 - 1740 A.D. |
165 |
|
1470 |
1350 - 1590 A.D. |
330 |
|
1140 |
980 - 1300 A.D. |
171 |
|
969 |
915 - 1020 A.D. |
144 |
|
825 |
740 - 910 A.D. |
420 |
|
405 |
290 - 520 A.D. |
60 |
|
345 |
210 - 480 A.D. |
60 |
|
285 |
150 - 420 A.D. |
???? |
|
Data from James J. Lienkaemper, U. S. Geological Survey, 2005
Instructions:
Read all the way through these instructions at least once before starting any work on this graph!
Refer to the table above. Assign each earthquake a number, starting with "1" for the most recent earthquake. The earthquake before that, we call "2", then "3", etc. It may seem backwards to have the oldest earthquake being called 10 counting down towards the present, but the reason is that we will continue to discover older and older events. Since we don't know how many there were in the past, we just keep adding one when we discover an earlier earthquake.
On the graph, draw two lines across only the column designated for a particular earthquake: one for the earliest possible date that the earthquake could have occurred, and a second to mark the latest possible date. This will form a single, small rectangle in each column. There is one exception: the last earthquake, "1", has an exact date, so simply draw one bold line for this event. Use the horizontal guidelines to help you mark the correct dates, but do not worry about being perfectly accurate.
When you have finished drawing these lines, then fill in, in each column, the rectangle bracketed by the lines. This will show the span of time during which each earthquake could have occurred.
DLESE Teaching Boxes | October 2005
