Archive for February 8th, 2013

February 8, 2013

Garfagnana, Lucca, Italy, 25/01/2013, 4.9Mw and aftershocks

An earthquake of magnitude (ML) 4.8 occurred at 15:48 Italian Standard Time January 25, 2013 at a depth of 15.5 km. The earthquake was located by the INGV National Seismic Network earthquake in the district of Garfagnana, between the provinces of Lucca, Modena and Pistoia.

The data below is located with the stations of the INGV National Seismic Network
Origin time (UTC): 14:48:18
Lat: 44.168N °N
Lon: 10.454 ° E
Magnitude (ML): 4.8
Depth: 15.5 km
Horizontal error: + / – 1.68 Km
Vertical error: + / – 0.72 Km
Magnitude error: + / – 0.27

Other Networks estimates of the event
Network, Mag, When, Lat, Long, Depth
GEOFON= 4.9Mw, 25/01/2013 14:48:19, 44.3, 10.48, 10
USGS= 5.0mb, 4.9Mw, 25/01/2013 14:48:18, 44.28, 10.527, 4.8
RASGS= 5.1mb, 25/01/2013 14:48:17, 44.28, 10.52, 10
EMSC= 4.9Mw, 25/01/2013 14:48:18, 44.17, 10.45, 15
LDEO= 5.2Ms, 25/01/2013 14:48:16, 44.25, 10.25, 33
GCMT= 5.0Mw,4.9Ms, 25/01/2013 14:48:22.0, 44.17, 10.49, 22.2

GCMT MTS

GCMT moment tensor solution

104 Aftershocks at 11.5 hours

summary

mag<1= 0, mag1= 82, mag2= 21
mag3= 0, mag4= 1, Total = 104

132 Aftershocks at 28 hours

summary

mag<1= 0, mag1= 104, mag2= 27
mag3= 0, mag4= 1 Total= 132

Aftershocks at 72 hours (3days)

summary

mag<1= 1, mag1= 188, mag2= 35,
mag3= 0, mag4= 1, Total= 225

Aftershocks at 227 hours (9.5days)

summary

mag<1= 1, mag1= 241, mag2= 47
mag3= 1, mag4= 1, Total = 291

The Båth’s Law states that the difference in magnitude between a main shock and its largest aftershock is approximately constant, independent of the main shock magnitude, typically 1.1–1.2 magnitude smaller.
At Garfagnana this may have occurred at 30/01/2013 11:42:01 p.m.UTC, 128:53:43 hours ( 5.3 days) after the main shock, 5.158 km SSE of the 4.9Mw location. It is the only magnitude 3 earthquake in the 2,695 km2 (58.17 km x 46.33 km) aftershock area up to 08/02/2013.

The search area used to compile the data on this page is a rectangle = 44.376713,10.104675,44.376713,10.836639,43.960037,10.836639,43.960037,10.104675,44.376713,10.104675.
This is shown on the 2 maps below as a red box.

INGV History 3/05/2005-24/01/2013

ANSS History 6/01/1969-13/12/2004

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