Earthquake with magnitude of ML 0.3 on date 12-05-2009 and time 07:30:22 (Italy) in region 3 km NW L'Aquila (AQ)

A magnitude ML 0.3 earthquake occured in region: 3 km NW L'Aquila (AQ), on

  • 12-05-2009 05:30:22 (UTC)
  • 12-05-2009 07:30:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.37, 13.37 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.

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 3 69753 69753
Lucoli AQ 10 1011 70764
Pizzoli AQ 10 4326 75090
Scoppito AQ 10 3727 78817
Tornimparte AQ 11 3187 82004
Barete AQ 12 737 82741
Ocre AQ 13 1167 83908
Fossa AQ 13 721 84629
Poggio Picenze AQ 15 1136 85765
Sant'Eusanio Forconese AQ 16 394 86159
Cagnano Amiterno AQ 16 1369 87528
Capitignano AQ 18 665 88193
Villa Sant'Angelo AQ 18 424 88617
Rocca di Cambio AQ 18 533 89150
San Demetrio ne' Vestini AQ 18 1854 91004
Barisciano AQ 19 1828 92832
Montereale AQ 20 2581 95413

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km NW of L'Aquila (69753 inhabitants)
42 Km SW of Teramo (54892 inhabitants)
63 Km E of Terni (111501 inhabitants)
65 Km W of Chieti (51815 inhabitants)
66 Km W of Montesilvano (53738 inhabitants)
66 Km NE of Tivoli (56533 inhabitants)
67 Km NE of Guidonia Montecelio (88673 inhabitants)
70 Km W of Pescara (121014 inhabitants)
85 Km SE of Foligno (57155 inhabitants)
91 Km NE of Velletri (53303 inhabitants)
91 Km NE of Roma (2864731 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last 90 days

Earthquakes since 1985

Significant earthquakes since 1000 AD until 2006

Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy ( that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

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 1.4
ML 0.3
42.37 13.37 10 2014-10-21
Bollettino Sismico Italiano INGV 862429
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2009-05-12 05:30:22 ± 0.84
Latitude 42.37 ± 0.02
Longitude 13.37 ± 0.04
Depth (km) 10 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 862429


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3480
Semi-minor axis of confidence ellipse (meter) 1881
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 273
Circular confidence region, given by single value of horizontal uncertainty (meter) 4167.7
Confidence level of the uncertainty (%) 68


Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
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) 0.54
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.16458
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 0.3
Uncertainty 0
Num. used stations
Type of magnitude ML
Reference to an origin 862429
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 16:22:16


Field Value
Value 1.4
Uncertainty 0.2
Num. used stations
Type of magnitude Md
Reference to an origin 862429
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 16:22:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ESLN.BHN. 2009-05-12T05:30:32.58 10.0 undecidable manual Pg 0 0 0
IV.CAMP.HHN. 2009-05-12T05:30:29.39 0.1 undecidable manual Sg 9 0.1646 -0.135 98
IV.CAMP.HHN. 2009-05-12T05:30:26.74 0.1 undecidable manual Pg 9 0.1646 0.24 96
MN.AQU.HHZ. 2009-05-12T05:30:26.18 0.1 undecidable manual Sg 134 0.0279 0.301 97
IV.T0104.EHZ. 2009-05-12T05:30:25.74 0.1 undecidable manual Sg 243 0.0297 -0.159 100
IV.T0104.EHZ. 2009-05-12T05:30:24.69 0.1 undecidable manual Pg 243 0.0297 0.283 97
MN.AQU.HHZ. 2009-05-12T05:30:23.84 0.1 undecidable manual Pg 134 0.0279 -0.555 91
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.AQU.HHN. ML:0 8.0E-5 0.21 AML other m 2009-05-12T05:30:23.84
MN.AQU.HHE. ML:0 8.0E-5 0.21 AML other m 2009-05-12T05:30:23.84
IV.T0104.EHN. ML:0 0.00027 1.4 AML other m 2009-05-12T05:30:24.69
IV.T0104.EHE. ML:0 0.00027 1.4 AML other m 2009-05-12T05:30:24.69
IV.CAMP.HHN. Md:1.6 15.8 END duration s
IV.CAMP.HHE. ML:0.3 1.5E-5 2.8 AML other m 2009-05-12T05:30:26.74
IV.ESLN.BHN. Md:0 15 END duration s
IV.ESLN.BHE. ML:0 0.00305 1.1 AML other m 2009-05-12T05:30:32.58
MN.AQU.HHZ. Md:1.3 12.5 END duration s
IV.T0104.EHZ. Md:1.2 11.2 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area

Focal Mechanisms

Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download