Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.1 on date 10-08-2004 and time 23:10:38 (UTC) in region 1 km S Colonna (RM)

A magnitude Md 2.1 earthquake occured in region: 1 km S Colonna (RM), on

  • 10-08-2004 23:10:38 (UTC)
  • 11-08-2004 01:10:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8250, 12.7520 at 11 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Colonna RM 1 4287 4287
Monte Compatri RM 2 11978 16265
Monte Porzio Catone RM 3 8693 24958
Rocca Priora RM 4 11962 36920
San Cesareo RM 4 15153 52073
Frascati RM 6 22087 74160
Zagarolo RM 7 17843 92003
Rocca di Papa RM 8 17034 109037
Gallicano nel Lazio RM 8 6334 115371
Grottaferrata RM 8 20327 135698
Marino RM 10 43026 178724
Palestrina RM 12 21672 200396
Nemi RM 12 1943 202339
Labico RM 12 6379 208718
Castel Gandolfo RM 12 8997 217715
Castel San Pietro Romano RM 12 902 218617
Ciampino RM 13 38412 257029
Lariano RM 13 13432 270461
Albano Laziale RM 13 41715 312176
Ariccia RM 13 19407 331583
Poli RM 14 2418 334001
Genzano di Roma RM 14 23970 357971
San Gregorio da Sassola RM 15 1619 359590
Casape RM 15 744 360334
Valmontone RM 15 15959 376293
Cave RM 15 11287 387580
Velletri RM 16 53303 440883
Tivoli RM 16 56533 497416
Rocca di Cave RM 16 377 497793
Lanuvio RM 17 13632 511425
Artena RM 17 14276 525701
Capranica Prenestina RM 17 351 526052
Genazzano RM 18 6036 532088
Castel Madama RM 20 7399 539487
Pisoniano RM 20 770 540257
Guidonia Montecelio RM 20 88673 628930

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km N of Velletri (53303 inhabitants)
16 Km S of Tivoli (56533 inhabitants)
20 Km S of Guidonia Montecelio (88673 inhabitants)
23 Km E of Roma (2864731 inhabitants)
27 Km NE of Pomezia (62966 inhabitants)
27 Km NE of Aprilia (73446 inhabitants)
42 Km NW of Latina (125985 inhabitants)
43 Km E of Fiumicino (78395 inhabitants)
43 Km N of Anzio (54211 inhabitants)
79 Km SW of L'Aquila (69753 inhabitants)
82 Km S of Terni (111501 inhabitants)
85 Km E of Civitavecchia (52991 inhabitants)
85 Km SE of Viterbo (67173 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 2.1
ML-VAX 1.5 		2004-08-10
23:10:38		 41.825 12.752 11 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 502979
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2004-08-10 23:10:38 ± 0.308
Latitude 41.8250 ± 0.0157
Longitude 12.7520 ± 0.0159
Depth (km) 11 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 502979

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2189.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00073
Epicentral distance of station farthest from the epicenter (degree) 0.00712
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 502979
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 01:01:06

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 5
Type of magnitude ML
Reference to an origin 502979
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SDI.Z. 2004-08-10T23:11:06.74 10.0 undecidable manual SG 97 0.7881 0.46 0.4
--.MNS.Z. 2004-08-10T23:10:59.15 10.0 undecidable manual SG 354 0.555 0.42 0.5
--.TOLF.Z. 2004-08-10T23:10:59.29 10.0 undecidable manual SG 293 0.5994 -0.9 0.2
--.PTQR.Z. 2004-08-10T23:10:57.36 10.0 undecidable manual SG 67 0.5106 -0.05 0.7
--.SDI.Z. 2004-08-10T23:10:53.88 10.0 undecidable manual PG 97 0.7881 -0.77 0.6
--.MNS.Z. 2004-08-10T23:10:51.34 10.0 undecidable manual PG 354 0.555 1.05 0.3
--.TOLF.Z. 2004-08-10T23:10:50.59 10.0 undecidable manual PG 293 0.5994 -0.54 1.1
--.PTQR.Z. 2004-08-10T23:10:49.30 10.0 undecidable manual PG 67 0.5106 -0.5 1.3
--.CERT.E. 2004-08-10T23:10:47.61 10.0 undecidable manual SG 53 0.2109 0.13 0.8
--.LAV9.Z. 2004-08-10T23:10:46.15 10.0 undecidable manual SG 194 0.1443 0.51 0.6
--.LAV9.Z. 2004-08-10T23:10:43.48 10.0 undecidable manual PG 194 0.1443 0.74 0.9
--.CERT.Z. 2004-08-10T23:10:43.76 10.0 positive manual PG 53 0.2109 -0.04 4.1
--.MA9.Z. 2004-08-10T23:10:43.70 10.0 undecidable manual SG 231 0.0777 -0.75 0.4
--.MA9.Z. 2004-08-10T23:10:41.75 10.0 undecidable manual PG 231 0.0777 0.06 2.1
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