Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 06-04-2009 and time 23:11:29 (Italy) in region 4 km NW L'Aquila (AQ)

A magnitude ML 1.7 earthquake occured in region: 4 km NW L'Aquila (AQ), on

  • 06-04-2009 21:11:29 (UTC)
  • 06-04-2009 23:11:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.3720, 13.3640 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
Scoppito AQ 9 3727 73480
Lucoli AQ 9 1011 74491
Pizzoli AQ 9 4326 78817
Tornimparte AQ 10 3187 82004
Barete AQ 11 737 82741
Ocre AQ 13 1167 83908
Fossa AQ 13 721 84629
Cagnano Amiterno AQ 15 1369 85998
Poggio Picenze AQ 16 1136 87134
Sant'Eusanio Forconese AQ 16 394 87528
Capitignano AQ 17 665 88193
Villa Sant'Angelo AQ 18 424 88617
Rocca di Cambio AQ 18 533 89150
San Demetrio ne' Vestini AQ 19 1854 91004
Barisciano AQ 19 1828 92832
Montereale AQ 20 2581 95413

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km NW of L'Aquila (69753 inhabitants)
43 Km SW of Teramo (54892 inhabitants)
62 Km E of Terni (111501 inhabitants)
65 Km NE of Tivoli (56533 inhabitants)
66 Km W of Chieti (51815 inhabitants)
67 Km W of Montesilvano (53738 inhabitants)
67 Km NE of Guidonia Montecelio (88673 inhabitants)
71 Km W of Pescara (121014 inhabitants)
85 Km SE of Foligno (57155 inhabitants)
90 Km NE of Roma (2864731 inhabitants)
90 Km NE of Velletri (53303 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 1.7 2009-04-06
21:11:29		 42.372 13.364 10 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 763059
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-04-06 21:11:29 ± 0.09
Latitude 42.3720 ± 0.0045
Longitude 13.3640 ± 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 763059

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 714
Semi-minor axis of confidence ellipse (meter) 500
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 91
Circular confidence region, given by single value of horizontal uncertainty (meter) 860.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 98
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0.03327
Epicentral distance of station farthest from the epicenter (degree) 0.53869
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 763059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:25:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
.INTR.HHZ. 2009-04-06T21:11:48.38 0.6 undecidable manual Sg 132 59.7957 0.429 42
.NRCA.SHZ. 2009-04-06T21:11:47.63 0.6 undecidable manual Sg 338 55.1004 0.922 35
.VVLD.HHE. 2009-04-06T21:11:47.96 0.6 undecidable manual Sg 159 59.6958 0.036 45
.PTQR.---. 2009-04-06T21:11:42.00 0.3 undecidable manual Sg 176 38.9277 -0.395 65
.VVLD.HHE. 2009-04-06T21:11:40.13 0.6 undecidable manual Pg 159 59.6958 0.113 45
.INTR.HHZ. 2009-04-06T21:11:40.33 0.3 undecidable manual Pg 132 59.7957 0.292 64
.TERO.HHZ. 2009-04-06T21:11:40.33 0.3 undecidable manual Sg 35 34.0437 -0.759 58
.CERT.---. 2009-04-06T21:11:39.29 0.1 undecidable manual Pg 214 56.499 -0.238 87
.NRCA.SHZ. 2009-04-06T21:11:39.30 0.3 undecidable manual Pg 338 55.1004 -0.021 69
IV.FIAM.HHZ. 2009-04-06T21:11:37.85 0.6 undecidable manual Sg 240 23.2545 -0.115 48
IV.FAGN.HHE. 2009-04-06T21:11:37.50 0.3 undecidable manual Sg 123 21.5673 0.096 72
IV.VCEL.EHE. 2009-04-06T21:11:37.08 0.3 undecidable manual Pg 86 39.1275 0.224 68
.CAMP.---. 2009-04-06T21:11:36.51 0.3 undecidable manual Sg 11 18.5703 0.041 73
.PTQR.---. 2009-04-06T21:11:36.73 0.3 undecidable manual Pg 176 38.9277 -0.1 70
.TERO.HHZ. 2009-04-06T21:11:35.72 0.1 undecidable manual Pg 35 34.0437 -0.352 89
IV.FIAM.HHZ. 2009-04-06T21:11:34.46 0.1 undecidable manual Pg 240 23.2545 0.192 94
IV.FAGN.HHE. 2009-04-06T21:11:34.60 0.3 undecidable manual Pg 123 21.5673 0.657 62
.CAMP.---. 2009-04-06T21:11:33.62 0.1 positive manual Pg 11 18.5703 0.213 94
MN.AQU.HHZ. 2009-04-06T21:11:32.30 0.1 undecidable manual Sg 123 3.6963 -0.499 91
MN.AQU.HHZ. 2009-04-06T21:11:31.31 0.1 undecidable manual Pg 123 3.6963 0.028 100
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