Earthquake with magnitude of ML 0.3 on date 08-05-2009 and time 02:37:51 (Italy) in region 4 km NW L'Aquila (AQ)

A magnitude ML 0.3 earthquake occured in region: 4 km NW L'Aquila (AQ), on

  • 08-05-2009 00:37:51 (UTC)
  • 08-05-2009 02:37:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.38, 13.38 at 6 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 4 69753 69753
Pizzoli AQ 9 4326 74079
Scoppito AQ 10 3727 77806
Lucoli AQ 10 1011 78817
Barete AQ 11 737 79554
Tornimparte AQ 12 3187 82741
Fossa AQ 13 721 83462
Ocre AQ 13 1167 84629
Poggio Picenze AQ 15 1136 85765
Cagnano Amiterno AQ 15 1369 87134
Sant'Eusanio Forconese AQ 16 394 87528
Capitignano AQ 17 665 88193
Villa Sant'Angelo AQ 18 424 88617
San Demetrio ne' Vestini AQ 18 1854 90471
Rocca di Cambio AQ 18 533 91004
Barisciano AQ 19 1828 92832
Montereale AQ 19 2581 95413
Campotosto AQ 20 542 95955

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km NW of L'Aquila (69753 inhabitants)
41 Km SW of Teramo (54892 inhabitants)
63 Km E of Terni (111501 inhabitants)
65 Km W of Chieti (51815 inhabitants)
65 Km W of Montesilvano (53738 inhabitants)
66 Km NE of Tivoli (56533 inhabitants)
68 Km NE of Guidonia Montecelio (88673 inhabitants)
69 Km W of Pescara (121014 inhabitants)
85 Km SE of Foligno (57155 inhabitants)
91 Km NE of Roma (2864731 inhabitants)
92 Km NE of Velletri (53303 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 three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
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 (http://zonesismiche.mi.ingv.it) 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

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
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 (http://www.haisentitoilterremoto.it/) 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 1.5
ML 0.3
2009-05-08
00:37:51
42.38 13.38 6 2014-10-21
12:27:13
Bollettino Sismico Italiano INGV 855319
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-05-08 00:37:51 ± 0.13
Latitude 42.38 ± 0.00
Longitude 13.38 ± 0.00
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 855319

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 380
Semi-minor axis of confidence ellipse (meter) 250
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 279
Circular confidence region, given by single value of horizontal uncertainty (meter) 500
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.03148
Epicentral distance of station farthest from the epicenter (degree) 0.15738
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitudes information

ML:0.3

Field Value
Value 0.3
Uncertainty 0
Num. used stations
Type of magnitude ML
Reference to an origin 855319
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 16:13:53

Md:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations
Type of magnitude Md
Reference to an origin 855319
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 16:13:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CAMP.HHZ. 2009-05-08T00:37:58.13 0.1 undecidable manual Sg 8 0.1574 0.041 97
IV.CAMP.HHZ. 2009-05-08T00:37:55.28 0.3 undecidable manual Pg 8 0.1574 -0.097 72
MN.AQU.HHZ. 2009-05-08T00:37:54.06 0.1 undecidable manual Sg 145 0.0315 -0.013 100
IV.T0104.EHZ. 2009-05-08T00:37:54.12 0.1 undecidable manual Sg 236 0.0351 -0.028 100
IV.T0104.EHZ. 2009-05-08T00:37:53.15 0.1 undecidable manual Pg 236 0.0351 0.048 99
MN.AQU.HHZ. 2009-05-08T00:37:53.08 0.1 undecidable manual Pg 145 0.0315 0.022 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.AQU.HHN. ML:0 0.00027 0.29 AML other m 2009-05-08T00:37:53.08
MN.AQU.HHE. ML:0 0.00027 0.29 AML other m 2009-05-08T00:37:53.08
IV.T0104.EHN. ML:0 0.0019 0.23 AML other m 2009-05-08T00:37:53.15
IV.T0104.EHE. ML:0 0.0019 0.23 AML other m 2009-05-08T00:37:53.15
IV.CAMP.HHN. ML:0.3 2.5E-5 0.28 AML other m 2009-05-08T00:37:55.28
IV.CAMP.HHE. ML:0.3 1.5E-5 0.7 AML other m 2009-05-08T00:37:55.28
MN.AQU.HHZ. Md:1.5 15 END duration s
IV.T0104.EHZ. Md:1.8 20 END duration s
IV.CAMP.HHZ. Md:1.2 10.9 END duration s
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download