When time allows, I'll post channel sets that I create to look at earthquakes on this "blog".

Instructions: To copy one of the channel sets on the iPad, press and hold your finger on part of the channel list. When you release you finger you will see text-selection handles. Select the channel set and choose copy. Then navigate to the seismogram settings tab and press and hold on the current channel list. When you release you will see text-selection options; choose Select All and then choose Paste to replace the current with a new set.

Tuesday
Oct162012

Southern Maine - 16 October, 2012, mb 4.6, Mw 4.0

Here are a channel list and some seismograms from this evening's earthquake in southern Maine.

The stations are from nearby seismometers in New Hampshire and Maine. If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 30 minutes of data, enter a "10" in the Sample-Rate field, and use the "Near" filters.

NE; FFD; --; BHZ; FRANKLIN DAM, NH, USA (UP-DOWN);
NE; FFD; --; BHE; FRANKLIN DAM, NH, USA (EAST-WEST);
NE; FFD; --; BHN; FRANKLIN DAM, NH, USA (NORTH-SOUTH);
NE; WVL; --; BHZ; WATERVILLE,ME, USA (UP-DOWN);
NE; WVL; --; BHE; WATERVILLE,ME, USA (EAST-WEST);
NE; WVL; --; BHN; WATERVILLE,ME, USA (NORTH-SOUTH);

 Here is a plot of the seismograms from the event.

Wednesday
Sep052012

Costa Rica, 05 September, 2012, Mw 7.6

This is a large earthquake in a region that has been studied very carefully for at least a decade. The closest station is not responding right now (JTS), but the USGS station in Honduras is. The channel list below includes both the close station and the Honduras station. Right now, I only receive data from TGUH. If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 30 minutes of data, enter a "10" in the Sample-Rate field,  and use the "Near" filters.

II; JTS; 00; BHZ; Las Juntas de Abangares, Costa Rica (Up-Down)
II; JTS; 00; BH1; Las Juntas de Abangares, Costa Rica (NNW-SSE)
II; JTS; 00; BH2; Las Juntas de Abangares, Costa Rica (NNE-SSW)
CU; TGUH; 00; BHZ; Tegucigalpa, Honduras (Up-Down)
CU; TGUH; 00; BH1; Tegucigalpa, Honduras (North-South)
CU; TGUH; 00; BH2; Tegucigalpa, Honduras (East-West)

 Here's a plot of the mainshock and early aftershocks at the nearby station

Sunday
Aug262012

Southern California Sequence, 26 August 2012 (M 4.6, 5.3, 4.9, 5.4)

A sequence of small to moderate-size earthquakes is occurring in southern California, south of the Salton Sea, near Brawley, CA.

Southern California is well instrumented and many of the data are available in real-time.  Here is a channel list for a station very close to the activity:

CI; SWS; --; BHZ; Westmorland, CA, USA (Up-Down)
CI; SWS; --; BHE; Westmorland, CA, USA (East-West)
CI; SWS; --; BHN; Westmorland, CA, USA (North-South)

If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 15 minutes of data, enter a "10" in the Sample-Rate field,  and use the "Near" filters. A plot of the most recent Ml 5.4 earthquake seismograms is show below.

 

Here is a plot of some of the most recent aftershocks (the green line identify the origin times of aftershocks that have already been located and reported by the U.S. Geological Survey):

Saturday
Aug112012

Northwestern Iran, 11 August, 2012, Mw 6.4, 6.3

Two strong earthquakes occurred in northwestern Iran today. You can monitor the aftershocks of the sequence using the station GNI, located to the north near Garni, Armenia. GNI is part of the Global Seismographic Network operated by the U.S. Geological Survey and IRIS; GNI is operated in coopoeration with the National Survey of Seismic Protection of Armenia.

IU; GNI; 00; BHZ; Garni, Armenia (Up-Down) 
IU; GNI; 00; BH2; Garni, Armenia (East-West) 
IU; GNI; 00; BH1; Garni, Armenia (North-South)

You could stream (use the automatic updates every ten minutes or so) about 45 minutes of data, enter a "10" in the Sample Rate field,  and use the "Near" filters.

The image below shows the recent aftershock activity. These events are small and are not located by the global seismic networks, so there are no origin time markers for them. But there are at least 10 aftershocks in this image.

The image below shows the signals from the two large earthquakes at the start of the sequence. The horizontals were driven off scale by the first event. 

Wednesday
Aug082012

08 August, 2012 - Los Angeles Area (Ml 4.5)

It's been a while since we've had a large earthquake. An interesting little sequence is occuring near Yorba Linda California, in the Los Angeles area.

The Los Angeles area is well instrumented and many of the data are available in real-time.  

CI; USC; --; BHZ; Univ. of S. California, CA, USA (Up-Down)
CI; BFS; --; BHZ; Mt. Baldy, CA, USA (Up-Down)
CI; SDD; --; BHZ; Mission Viejo, CA, USA (Up-Down)
CI; FMP; --; BHZ; San Pedro, CA, USA (Up-Down)

If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 15 minutes of data, enter a "*" in the Sample Rate field,  and use the "Near" filters. A plot of the most recent Ml 4.5 earthquake seismograms is show below.

The display above contains four vertical component seismograms from Los Angeles area seismic stations. The image below is a plot of the three components of motion at one of those stations, Mount Baldy, which is located roughly north of the earthquake.

Here's the channel list for the image above:

CI; BFS; --; BHZ; MT. BALDY, CA, USA (UP-DOWN)
CI; BFS; --; BHE; MT. BALDY, CA, USA (EAST-WEST)
CI; BFS; --; BHN; MT. BALDY, CA, USA (NORTH-SOUTH)

 

Saturday
Jun302012

Northern Xinjiang, China - 29 June 2012, Mw 6.3

A magnitude 6.3 (USGS) earthquake occurred in a remote region of western China. Larger aftershocks should be visible on the station listed below, which is located several hundred kilometers from the earthquake. The station is part of the Global Seismographic Network operated by the U.S. Geological Survey and IRIS (on behalf of the US National Science Foundation), in cooperation with scientists and staff in Kazakhstan.

IU; MAKZ; 00; BHZ; Makanchi, Kazakhstan (Up-Down)
IU; MAKZ; 00; BH2; Makanchi, Kazakhstan (East-West)
IU; MAKZ; 00; BH1; Makanchi, Kazakhstan (North-South)

If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 15 minutes of data, enter a "*" in the Sample Rate field,  and use the "Near" filters. A plot of the mainshock displacement seismograms is show below.

Tuesday
Jun192012

Southeastern Australia - 19 June, 2012, M 5.2 

A magnitude 5.2 (USGS) earthquake occurred in southeastern Australia, east of Melbourne about 5 km southwest of Moe, Victoria. Larger aftershocks should be visible on the station listed below. The station is operated by the Geoscience Australia, and is within roughly 100 kilometers of the earthquake.

AU; TOO; --; BHZ; Toolangi, Victoria, AU (Up-Down) 
AU; TOO; --; BHE; Toolangi, Victoria, AU (East-West) 
AU; TOO; --; BHN; Toolangi, Victoria, AU (North-South)

If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 15 minutes of data, enter a "*" in the Sample Rate field,  and use the "Near" filters.

Monday
May212012

Bulgaria - 22 May 2012, Mw 5.6

A magnitude 5.6 (USGS) earthquake occurred in Bulgaria, near the city of Sofia. Aftershocks should be visible on the station listed below. The station is operated by the MEDNET Project, Rome, Italy and is within a few 10's of kilometers of the earthquake.

MN; VTS; --; BHZ; Vitosha, Bulgary (Up-Down) 
MN; VTS; --; BHE; Vitosha, Bulgary (East-West) 
MN; VTS; --; BHN; Vitosha, Bulgary (North-South)

If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 15 minutes of data, enter a "*" in the Sample Rate field,  and use the "Near" filters.

The image above shows many small early aftershocks from the event, which occurred at 33 seconds after midnight UTC. For information on smaller magnitude earthquakes, see the web site of the Geophysics Group of the Bulgarian Academy of Sciences ( http://ndc.geophys.bas.bg/ ).

Sunday
May202012

Northern Italy - 20 May 2012, Mw 6.0

A magnitude about 6 earthquake occurred earlier today in northern Italy, near the city of Camposanto. Aftershocks should be visible on the station listed below. The station is operated by the MEDNET Project, Rome, Italy and is about 50-75 km from the earthquake, so only the larger aftershocks will be visible at the site.

MN; VLC; --; BHZ; Villacollemandina, Italy (Up-Down) 
MN; VLC; --; BHE; Villacollemandina, Italy (East-West) 
MN; VLC; --; BHN; Villacollemandina, Italy (North-South)

If you want to try to monitor the activity, you could stream (use the automatic updates every five minutes or so) about 15 minutes of data, enter a "*" in the Sample Rate field,  and use the "Near" filters.

The above is a plot of the ground displacement produced by the mainshock (Mw 6.0). The times are UTC, the local time referred to is eastern US time. The numbers on the left indicate the maximum amplitude in microns (these seismograms were integrated from ground velocity to ground displacement).

Wednesday
Apr112012

Off the Coast of Sumatra - 11 Apr, 2012 Mw 8.6 & 8.2

Two large, strike-slip intraplate earthquakes occurred off the coast of Sumatra on 11 April. THe Mw 8.6 is one of the largest strike-slip earthquakes ever seen.

The closest real-time station is station PSI, located in Prapat, Sumatera, Indonesia, a few hundred kilometers from the quake. This station seems to be a few hours behind the current time.

PS; PSI;--; BHZ; Prapat, Sumatera, Indonesia (Up-Down)
PS; PSI; --; BHE; Prapat, Sumatera, Indonesia, (East-West)
PS; PSI; --; BHN; Prapat, Sumatera, Indonesia (North-South)

Here's another station that has closer to real-time data

MY; IPM;--; BHZ; Ipoh, Malaysia (Up-Down)
MY; IPM; --; BHE; Ipoh, Malaysia (East-West)
MY; IPM; --; BHN; Ipoh, Malaysia (North-South)

Use the "near" filter and you should see many of the smaller aftershocks that are occurring.

Here's the recording of the mainshock with the global channel set. 

Friday
Mar232012

A Comment on Epicentral+ on the iPad (3)

08 Apr, 2012: I submitted an update to the app store that changes the way the seismograms are displayed and zoomed that alleviates some of the speed problems.

I find that the seismogram display on the iPad three is substantially slower than I expected. This could be related to plotting on the higher resolution screen being more of a chore than faced by the 1st and 2nd generation iPads. The bottom line is that the iPad 1 running iOS 4.3 was significantly faster at drawing the seismograms than anything I've seen running iOS5.x. 

Anyway, to get around the problem, you might consider using lower seismogram sample rates until I can try to address the issue. For example, if you are using the "Far" filters, you can use a rate of 0.5 or 0.25 samples per second (SPS) on LH* channels to reduce the graphics burden. This puts more load on the seismogram server, which resamples the seismograms, but also results in fewer bytes being transmitted.

Wednesday
Mar212012

Southern Mexico (Oaxaca) Earthquake - 20 March, 2012, Mw 7.4

The 20 March, 2012 magnitude 7.4 Oaxaca, Mexico Earthquake is the largest magnitude earthquake we've seen in a while; the event was about 20 km deep and is associated with the subduction of the Pacific Ocean floor beneath southern Mexico (along the Cocos and North America plate boundary).

The closest real-time station is UNM, located in Mexico City, a few hundred kilometers from the quake. 

G; UNM; 00; BHZ; UNAM, Mexico (Up-Down)
G; UNM; 00; BHE; UNAM, Mexico, (East-West)
G; UNM; 00; BHN; UNAM, Mexico (North-South)

Here's the recording of the mainshock, which overwhelmed the instrumented. The amplitudes are clipped (large flat region of the signal).