Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 26-03-2009 and time 21:35:02 (UTC) in region 2 km W Castel Gandolfo (RM)

A magnitude ML 1.8 earthquake occured in region: 2 km W Castel Gandolfo (RM), on

  • 26-03-2009 21:35:02 (UTC)
  • 26-03-2009 22:35:02 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.7510, 12.6320 at 4 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 2 8997 8997
Marino RM 3 43026 52023
Albano Laziale RM 3 41715 93738
Ariccia RM 5 19407 113145
Grottaferrata RM 5 20327 133472
Ciampino RM 6 38412 171884
Rocca di Papa RM 7 17034 188918
Genzano di Roma RM 7 23970 212888
Frascati RM 8 22087 234975
Nemi RM 8 1943 236918
Lanuvio RM 10 13632 250550
Monte Porzio Catone RM 10 8693 259243
Monte Compatri RM 11 11978 271221
Rocca Priora RM 12 11962 283183
Colonna RM 14 4287 287470
Pomezia RM 14 62966 350436
Velletri RM 14 53303 403739
San Cesareo RM 16 15153 418892
Lariano RM 17 13432 432324
Ardea RM 17 49183 481507
Aprilia LT 17 73446 554953
Zagarolo RM 19 17843 572796
Roma RM 20 2864731 3437527

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km NE of Pomezia (62966 inhabitants)
14 Km NW of Velletri (53303 inhabitants)
17 Km N of Aprilia (73446 inhabitants)
20 Km SE of Roma (2864731 inhabitants)
28 Km SW of Tivoli (56533 inhabitants)
29 Km S of Guidonia Montecelio (88673 inhabitants)
33 Km E of Fiumicino (78395 inhabitants)
34 Km N of Anzio (54211 inhabitants)
39 Km NW of Latina (125985 inhabitants)
79 Km E of Civitavecchia (52991 inhabitants)
86 Km SE of Viterbo (67173 inhabitants)
90 Km S of Terni (111501 inhabitants)
92 Km SW of L'Aquila (69753 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 		Md 1.9
ML 1.8 		2009-03-26
21:35:02		 41.751 12.632 4 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 752279
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2009-03-26 21:35:02 ± 0.22
Latitude 41.7510 ± 0.0063
Longitude 12.6320 ± 0.0096
Depth (km) 4 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 752279

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 729
Semi-minor axis of confidence ellipse (meter) 574
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 231
Circular confidence region, given by single value of horizontal uncertainty (meter) 1063.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 165
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.11601
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 752279
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:13:27

Md:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations
Type of magnitude Md
Reference to an origin 752279
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 14:13:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ALJA.HHZ. 2009-03-26T21:35:16.12 10.0 undecidable manual Pg 0 0 0
IV.ROM9.HHE. 2009-03-26T21:35:07.00 0.6 undecidable manual Sg 311 12.876 0.456 45
IV.RMP.HHN. 2009-03-26T21:35:06.54 0.3 undecidable manual Sg 41 8.7801 0.345 70
IV.LAV9.SHZ. 2009-03-26T21:35:06.88 0.6 undecidable manual Sg 146 9.879 0.347 47
IV.RDP.BHZ. 2009-03-26T21:35:05.68 0.3 undecidable manual Sg 84 6.993 0.036 75
IV.ROM9.HHE. 2009-03-26T21:35:05.24 0.6 undecidable manual Pg 311 12.876 -0.317 47
IV.RMP.HHN. 2009-03-26T21:35:04.69 0.1 undecidable manual Pg 41 8.7801 -0.097 98
IV.MA9.HHE. 2009-03-26T21:35:04.49 0.3 undecidable manual Sg 47 3.0969 -0.084 75
IV.LAV9.SHZ. 2009-03-26T21:35:04.97 0.1 undecidable manual Pg 146 9.879 -0.013 100
IV.RDP.BHZ. 2009-03-26T21:35:04.40 0.1 undecidable manual Pg 84 6.993 -0.069 99
IV.MA9.HHE. 2009-03-26T21:35:03.52 0.3 undecidable manual Pg 47 3.0969 -0.327 71
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