Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 06-04-2009 and time 22:55:43 (Italy) in region 4 km SW L'Aquila (AQ)

A magnitude ML 1.9 earthquake occured in region: 4 km SW L'Aquila (AQ), on

  • 06-04-2009 20:55:43 (UTC)
  • 06-04-2009 22:55:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.3240, 13.3720 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
L'Aquila AQ 4 69753 69753
Lucoli AQ 5 1011 70764
Tornimparte AQ 7 3187 73951
Ocre AQ 9 1167 75118
Fossa AQ 10 721 75839
Scoppito AQ 11 3727 79566
Sant'Eusanio Forconese AQ 13 394 79960
Rocca di Cambio AQ 14 533 80493
Pizzoli AQ 14 4326 84819
Poggio Picenze AQ 14 1136 85955
Villa Sant'Angelo AQ 15 424 86379
San Demetrio ne' Vestini AQ 16 1854 88233
Barete AQ 16 737 88970
Rocca di Mezzo AQ 18 1526 90496
Barisciano AQ 18 1828 92324
Borgorose RI 18 4591 96915
Fagnano Alto AQ 19 418 97333
Cagnano Amiterno AQ 19 1369 98702

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km SW of L'Aquila (69753 inhabitants)
46 Km SW of Teramo (54892 inhabitants)
62 Km NE of Tivoli (56533 inhabitants)
64 Km NE of Guidonia Montecelio (88673 inhabitants)
65 Km E of Terni (111501 inhabitants)
66 Km W of Chieti (51815 inhabitants)
67 Km W of Montesilvano (53738 inhabitants)
71 Km W of Pescara (121014 inhabitants)
86 Km NE of Velletri (53303 inhabitants)
87 Km NE of Roma (2864731 inhabitants)
89 Km SE of Foligno (57155 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.9 2009-04-06
20:55:43		 42.324 13.372 10 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 762899
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-04-06 20:55:43 ± 0.09
Latitude 42.3240 ± 0.0054
Longitude 13.3720 ± 0.0085
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 762899

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 662
Semi-minor axis of confidence ellipse (meter) 536
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 288
Circular confidence region, given by single value of horizontal uncertainty (meter) 922.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 47
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.51
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.21498
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 17
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 762899
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:25:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SNTG.SHZ. 2009-04-06T20:56:18.27 10.0 undecidable manual Sg 0 0 0
IV.PIEI.HHN. 2009-04-06T20:56:13.47 10.0 undecidable manual Pg 0 0 0
IV.RMP.HHZ. 2009-04-06T20:56:12.36 10.0 undecidable manual Sg 0 0 0
IV.POFI.HHE. 2009-04-06T20:56:09.35 10.0 undecidable manual Sg 0 0 0
IV.CERA.HHN. 2009-04-06T20:56:08.03 10.0 undecidable manual Pg 0 0 0
IV.SDI.SHZ. 2009-04-06T20:56:08.87 10.0 undecidable manual Sg 0 0 0
IV.ARVD.HHZ. 2009-04-06T20:56:06.32 0.3 undecidable manual Pg 345 134.865 0.421 56
IV.NRCA.SHZ. 2009-04-06T20:56:03.22 0.6 undecidable manual Sg 340 60.2952 0.867 37
IV.RDP.BHN. 2009-04-06T20:56:02.42 10.0 undecidable manual Pg 0 0 0
IV.SNTG.SHZ. 2009-04-06T20:56:02.53 10.0 undecidable manual Pg 0 0 0
IV.INTR.HHZ. 2009-04-06T20:56:00.50 0.6 undecidable manual Sg 128 55.8996 -0.656 41
IV.ASSB.HHE. 2009-04-06T20:56:00.65 0.3 undecidable manual Pg 324 98.7234 0.327 62
IV.RMP.HHZ. 2009-04-06T20:55:59.27 10.0 undecidable manual Pg 0 0 0
IV.GIUL.HHE. 2009-04-06T20:55:59.54 0.6 undecidable manual Pg 187 85.4478 1.257 29
IV.SDI.SHZ. 2009-04-06T20:55:57.93 10.0 undecidable manual Pg 0 0 0
IV.TERO.HHE. 2009-04-06T20:55:56.58 0.3 undecidable manual Sg 30 38.2284 0.124 73
IV.OFFI.HHN. 2009-04-06T20:55:56.78 0.6 undecidable manual Pg 21 72.4719 0.496 42
IV.PTQR.SHZ. 2009-04-06T20:55:55.18 0.3 undecidable manual Sg 176 33.5442 -0.025 75
IV.GUAR.HHE. 2009-04-06T20:55:54.83 10.0 undecidable manual Pg 0 0 0
IV.MTCE.HHN. 2009-04-06T20:55:54.12 0.6 undecidable manual Pg 237 61.5939 -0.484 43
IV.NRCA.SHZ. 2009-04-06T20:55:54.44 0.3 undecidable manual Pg 340 60.2952 0.026 71
IV.MNS.HHZ. 2009-04-06T20:55:53.55 0.3 undecidable manual Pg 277 56.9985 -0.352 67
IV.CERT.HHN. 2009-04-06T20:55:53.14 0.1 undecidable manual Pg 218 52.503 -0.061 96
IV.STR3.BHZ. 2009-04-06T20:55:53.72 10.0 undecidable manual Pg 0 0 0
IV.INTR.HHZ. 2009-04-06T20:55:53.66 0.3 undecidable manual Pg 128 55.8996 -0.064 71
IV.VVLD.HHN. 2009-04-06T20:55:53.69 0.3 undecidable manual Pg 158 54.501 0.182 70
IV.FAGN.HHN. 2009-04-06T20:55:51.12 0.6 undecidable manual Sg 110 18.5703 0.228 49
.CAMP.---. 2009-04-06T20:55:51.77 0.6 undecidable manual Sg 7 23.754 -0.731 42
IV.FIAM.HHE. 2009-04-06T20:55:51.76 0.3 undecidable manual Sg 254 21.7671 -0.125 75
IV.VCEL.EHE. 2009-04-06T20:55:51.39 0.3 undecidable manual Pg 78 39.2274 0.23 71
IV.TERO.HHE. 2009-04-06T20:55:50.26 0.1 undecidable manual Pg 30 38.2284 -0.748 81
IV.PTQR.SHZ. 2009-04-06T20:55:49.75 0.6 undecidable manual Pg 176 33.5442 -0.534 44
IV.FIAM.HHE. 2009-04-06T20:55:48.51 0.1 positive manual Pg 254 21.7671 0.142 99
.CAMP.---. 2009-04-06T20:55:48.41 0.1 undecidable manual Pg 7 23.754 -0.319 95
IV.FAGN.HHN. 2009-04-06T20:55:47.93 0.1 undecidable manual Pg 110 18.5703 0.137 100
MN.AQU.HHZ. 2009-04-06T20:55:47.36 0.3 undecidable manual Sg 37 4.1958 0.019 79
MN.AQU.HHZ. 2009-04-06T20:55:46.01 0.1 negative manual Pg 37 4.1958 0.264 100
IV.POFI.HHE. 2009-04-06T20:55:43.43 10.0 undecidable manual Pg 0 0 0
IV.GROG.HHZ. 2009-04-06T20:55:43.65 10.0 undecidable manual Pg 0 0 0
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download