Earthquake with magnitude of ML 0.4 on date 15-08-2011 and time 04:33:13 (Italy) in region 6 km NW L'Aquila (AQ)

A magnitude ML 0.4 earthquake occured in region: 6 km NW L'Aquila (AQ), on

  • 15-08-2011 02:33:13 (UTC)
  • 15-08-2011 04:33:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.39, 13.35 at 8 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.

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 6 69753 69753
Pizzoli AQ 7 4326 74079
Scoppito AQ 8 3727 77806
Barete AQ 9 737 78543
Lucoli AQ 11 1011 79554
Tornimparte AQ 12 3187 82741
Cagnano Amiterno AQ 13 1369 84110
Capitignano AQ 15 665 84775
Ocre AQ 15 1167 85942
Fossa AQ 15 721 86663
Montereale AQ 17 2581 89244
Poggio Picenze AQ 17 1136 90380
Sant'Eusanio Forconese AQ 18 394 90774
Campotosto AQ 19 542 91316

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NW of L'Aquila (69753 inhabitants)
42 Km SW of Teramo (54892 inhabitants)
61 Km E of Terni (111501 inhabitants)
66 Km NE of Tivoli (56533 inhabitants)
67 Km W of Montesilvano (53738 inhabitants)
67 Km W of Chieti (51815 inhabitants)
67 Km NE of Guidonia Montecelio (88673 inhabitants)
71 Km W of Pescara (121014 inhabitants)
82 Km SE of Foligno (57155 inhabitants)
91 Km NE of Roma (2864731 inhabitants)
92 Km NE of Velletri (53303 inhabitants)
Recent and historical Seismicity
Seismic hazard
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire ( that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 1.6
ML 0.4
42.39 13.35 8 2014-10-21
Bollettino Sismico Italiano INGV 1272059
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2011-08-15 02:33:13 ± 0.8
Latitude 42.39 ± 0.02
Longitude 13.35 ± 0.06
Depth (km) 8 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1272059


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 4877
Semi-minor axis of confidence ellipse (meter) 663
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 5092.2
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 241
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.58
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.21134
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 3
Magnitudes information


Field Value
Value 0.4
Uncertainty 0.6
Num. used stations
Type of magnitude ML
Reference to an origin 1272059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 01:07:10


Field Value
Value 1.6
Uncertainty 0.3
Num. used stations
Type of magnitude Md
Reference to an origin 1272059
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-06 01:07:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FNVD.HHZ. 2011-08-15T02:33:34.77 10.0 undecidable manual Pg 0 0 0
IV.FAGN.HHN. 2011-08-15T02:33:21.47 0.6 undecidable manual Sg 126 0.2113 -0.474 45
IV.CAMP.HHE. 2011-08-15T02:33:19.95 0.3 undecidable manual Sg 16 0.1502 0.172 73
IV.FAGN.HHN. 2011-08-15T02:33:18.87 0.3 undecidable manual Pg 126 0.2113 0.565 66
IV.CAMP.HHE. 2011-08-15T02:33:16.83 0.1 undecidable manual Pg 16 0.1502 -0.225 97
MN.AQU.HHZ. 2011-08-15T02:33:16.95 0.3 undecidable manual Sg 135 0.0531 0.118 76
MN.AQU.HHZ. 2011-08-15T02:33:15.20 0.1 undecidable manual Pg 135 0.0531 -0.154 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CAMP.HHN. ML:0 1.5E-5 0.44 AML other m 2011-08-15T02:33:16.83
IV.CAMP.HHE. Md:1.3 11.1 END duration s
IV.FAGN.HHN. Md:2 27 END duration s
IV.FAGN.HHE. ML:0.8 4.5E-5 0.44 AML other m 2011-08-15T02:33:18.87
IV.FNVD.HHN. ML:0 0.00116 0.04 AML other m 2011-08-15T02:33:34.77
IV.FNVD.HHE. ML:0 0.00031 0.04 AML other m 2011-08-15T02:33:34.77
MN.AQU.HHZ. Md:1.5 15 END duration s
IV.FNVD.HHZ. Md:0 12 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download