Earthquake with magnitude of ML 1.1 on date 27-03-2009 and time 02:03:30 (Italy) in region 3 km W Castel Gandolfo (RM)

A magnitude ML 1.1 earthquake occured in region: 3 km W Castel Gandolfo (RM), on

  • 27-03-2009 01:03:30 (UTC)
  • 27-03-2009 02:03:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.75, 12.62 at 0 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
Castel Gandolfo RM 3 8997 8997
Marino RM 4 43026 52023
Albano Laziale RM 4 41715 93738
Ariccia RM 5 19407 113145
Grottaferrata RM 6 20327 133472
Ciampino RM 6 38412 171884
Rocca di Papa RM 7 17034 188918
Genzano di Roma RM 8 23970 212888
Frascati RM 8 22087 234975
Nemi RM 9 1943 236918
Lanuvio RM 11 13632 250550
Monte Porzio Catone RM 11 8693 259243
Monte Compatri RM 12 11978 271221
Rocca Priora RM 13 11962 283183
Pomezia RM 14 62966 346149
Colonna RM 14 4287 350436
Velletri RM 15 53303 403739
San Cesareo RM 17 15153 418892
Ardea RM 17 49183 468075
Aprilia LT 18 73446 541521
Lariano RM 18 13432 554953
Roma RM 19 2864731 3419684
Zagarolo RM 20 17843 3437527

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km NE of Pomezia (62966 inhabitants)
15 Km NW of Velletri (53303 inhabitants)
18 Km N of Aprilia (73446 inhabitants)
19 Km SE of Roma (2864731 inhabitants)
28 Km SW of Tivoli (56533 inhabitants)
29 Km SW of Guidonia Montecelio (88673 inhabitants)
32 Km E of Fiumicino (78395 inhabitants)
34 Km N of Anzio (54211 inhabitants)
39 Km NW of Latina (125985 inhabitants)
78 Km E of Civitavecchia (52991 inhabitants)
85 Km SE of Viterbo (67173 inhabitants)
90 Km S of Terni (111501 inhabitants)
93 Km SW of L'Aquila (69753 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 1.7
ML 1.1
2009-03-27
01:03:30
41.75 12.62 0 2014-10-21
12:27:13
Bollettino Sismico Italiano INGV 752309
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-03-27 01:03:30 ± 0.35
Latitude 41.75 ± 0.01
Longitude 12.62 ± 0.02
Depth (km) 0 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 752309

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1842
Semi-minor axis of confidence ellipse (meter) 1052
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) 1886.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 264
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.09443
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 4
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 752309
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:13:29

Md:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations
Type of magnitude Md
Reference to an origin 752309
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:13:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PRMA.HHZ. 2009-03-27T01:03:49.36 10.0 undecidable manual Pg 0 0 0
IV.RMP.HHZ. 2009-03-27T01:03:33.57 0.3 undecidable manual Sg 46 0.0836 0.322 71
IV.LAV9.SHZ. 2009-03-27T01:03:32.38 0.3 undecidable manual Pg 142 0.0944 0.26 71
IV.RDP.BHN. 2009-03-27T01:03:32.79 0.3 undecidable manual Sg 85 0.071 0.034 75
IV.RDP.BHN. 2009-03-27T01:03:31.34 0.1 undecidable manual Pg 85 0.071 -0.26 96
IV.RMP.HHZ. 2009-03-27T01:03:31.92 0.1 undecidable manual Pg 46 0.0836 0.035 100
IV.MA9.HHZ. 2009-03-27T01:03:31.24 0.3 undecidable manual Sg 58 0.0333 -0.055 75
IV.MA9.HHZ. 2009-03-27T01:03:30.57 0.1 undecidable manual Pg 58 0.0333 -0.187 98
IV.CDCA.EHZ. 2009-03-27T01:03:28.57 10.0 undecidable manual Pg 0 0 0
IV.FAEN.HHE. 2009-03-27T01:03:04.88 10.0 undecidable manual Pg 0 0 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CDCA.EHN. ML:0 6.0E-5 2.6 AML other m 2009-03-27T01:03:28.57
IV.CDCA.EHE. ML:0 6.0E-5 0.28 AML other m 2009-03-27T01:03:28.57
IV.MA9.HHN. ML:0.9 0.000505 0.48 AML other m 2009-03-27T01:03:30.57
IV.MA9.HHE. ML:0.9 0.000465 0.6 AML other m 2009-03-27T01:03:30.57
IV.RDP.BHN. Md:1.8 21.6 END duration s
IV.RDP.BHE. ML:1.1 0.00036 0.52 AML other m 2009-03-27T01:03:31.34
IV.RMP.HHN. ML:1.1 0.0003 0.16 AML other m 2009-03-27T01:03:31.92
IV.RMP.HHE. ML:1.1 0.00022 0.38 AML other m 2009-03-27T01:03:31.92
IV.LAV9.SHZ. Md:1.8 20.8 END duration s
IV.PRMA.HHN. ML:0 0.000135 5.44 AML other m 2009-03-27T01:03:49.36
IV.PRMA.HHE. ML:0 5.5E-5 1.52 AML other m 2009-03-27T01:03:49.36
IV.FAEN.HHE. Md:0 31 END duration s
IV.CDCA.EHZ. Md:0 15 END duration s
IV.MA9.HHZ. Md:1.5 16.1 END duration s
IV.RMP.HHZ. Md:1.6 17 END duration s
IV.PRMA.HHZ. Md:0 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