For educators, college/university faculty and professionals interested in the instruction of seismological concepts in primary and secondary classrooms.
This list has moved to the Monthly Educator Newsletter at http://eepurl.com/ijjmVL
- Email address
- irisepo@lists.ds.iris.edu
- Type
-
Announcement
Announcement lists are for sending a one-way message to a wide audience. Anyone can post a message — only subscribe if you want to start receiving this type of announcement.
- Subscribers
- 1078
- Moderated by
- Tammy Bravo,
- Related tags
- None
April
March
February
January
March
February
January
December
November
October
September
August
July
June
May
April
March
February
January
November
October
September
August
July
June
May
April
March
February
January
December
November
October
September
August
July
June
May
April
March
February
January
November
October
September
August
July
June
May
April
March
February
January
December
November
October (1)
September
August
July
June (1)
May
April (1)
March (1)
February
January
November
October (1)
September
August
July
June (1)
May
April (1)
March (1)
February
January
December
November
October
September
August
July
June
May
April
March
February
January
November
October
September
August
July
June
May
April
March
February
January
December
November
October (1)
September
August
July
June (1)
May (2)
April (1)
March
February
January
November
October (1)
September
August
July
June (1)
May (2)
April (1)
March
February
January
December
November (1)
October (1)
September (1)
August (3)
July (3)
June (1)
May
April (3)
March (2)
February (2)
January
November (1)
October (1)
September (1)
August (3)
July (3)
June (1)
May
April (3)
March (2)
February (2)
January
December
November
October (1)
September (1)
August
July
June
May (1)
April (1)
March (1)
February
January
November
October (1)
September (1)
August
July
June
May (1)
April (1)
March (1)
February
January
December (1)
November
October (1)
September
August
July (3)
June (5)
May (5)
April (11)
March
February (15)
January (16)
November
October (1)
September
August
July (3)
June (5)
May (5)
April (11)
March
February (15)
January (16)
Active Message Threads for May 2007
John or Jan Lahr
Hi Chris,
Good questions.
For the helicorder view AmaSeis only allows one filter to filter out
high frequencies and one to filter out low frequencies.
For example, if you want to enhance the high frequency signals from
local events on your helicorder record, you might filter out
frequencies below 1.5 Hz, which leaves frequencies between 1.5 Hz and
3 Hz. (Note that because we are only sampling at 6 Hz, the highest
frequency that can be resolved is 3 Hz.) The bottom of the
helicorder re…
[more]
Replies
-
RE: Another example of filtering - Chris Midden - 2007-05-03 22:33:57
A while back I showed how to set up a helicorder filter in AmaSeis so
that the surface waves from distant earthquakes would be enhanced.
(See: http://jclahr.com/science/psn/as1/filtering/index.html)
The other day I received an earthquake notification message* from the
USGS about a 3.1 earthquake not too far from my station in Corvallis,
Oregon. Although I couldn't see anything on my helicorder record,
especially with the filter I was using to enhance low frequencies, by
switching to a f…
[more]
Replies
-
RE: Another example of filtering - Chris Midden - 2007-05-03 15:37:20
