Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.2 on date 07-02-1990 and time 04:27:04 (Italy) in region 7 km NW Colonna (RM)

A magnitude Md 2.2 earthquake occured in region: 7 km NW Colonna (RM), on

  • 07-02-1990 03:27:04 (UTC)
  • 07-02-1990 04:27:04 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.8900, 12.7230 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.

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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 7 4287 4287
Monte Porzio Catone RM 8 8693 12980
Gallicano nel Lazio RM 9 6334 19314
Monte Compatri RM 9 11978 31292
Frascati RM 10 22087 53379
San Cesareo RM 10 15153 68532
Tivoli RM 10 56533 125065
Zagarolo RM 10 17843 142908
Rocca Priora RM 11 11962 154870
Grottaferrata RM 12 20327 175197
Guidonia Montecelio RM 12 88673 263870
San Gregorio da Sassola RM 13 1619 265489
Casape RM 14 744 266233
Ciampino RM 14 38412 304645
Rocca di Papa RM 14 17034 321679
Poli RM 14 2418 324097
Marino RM 14 43026 367123
Fonte Nuova RM 15 32562 399685
Palestrina RM 15 21672 421357
Castel San Pietro Romano RM 15 902 422259
Castel Madama RM 16 7399 429658
Sant'Angelo Romano RM 16 5018 434676
Marcellina RM 17 7280 441956
San Polo dei Cavalieri RM 17 2992 444948
Castel Gandolfo RM 17 8997 453945
Mentana RM 18 22921 476866
Labico RM 18 6379 483245
Albano Laziale RM 19 41715 524960
Nemi RM 19 1943 526903
Cave RM 19 11287 538190
Rocca di Cave RM 19 377 538567
Ariccia RM 19 19407 557974
Capranica Prenestina RM 19 351 558325
Pisoniano RM 20 770 559095
Roma RM 20 2864731 3423826
Vicovaro RM 20 4019 3427845
Ciciliano RM 20 1336 3429181
Palombara Sabina RM 20 13269 3442450

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SW of Tivoli (56533 inhabitants)
12 Km S of Guidonia Montecelio (88673 inhabitants)
20 Km E of Roma (2864731 inhabitants)
23 Km N of Velletri (53303 inhabitants)
30 Km NE of Pomezia (62966 inhabitants)
33 Km N of Aprilia (73446 inhabitants)
42 Km E of Fiumicino (78395 inhabitants)
49 Km NW of Latina (125985 inhabitants)
50 Km N of Anzio (54211 inhabitants)
75 Km S of Terni (111501 inhabitants)
76 Km SW of L'Aquila (69753 inhabitants)
78 Km SE of Viterbo (67173 inhabitants)
80 Km E of Civitavecchia (52991 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 2.2
ML-VAX 1.6 		1990-02-07
03:27:04		 41.89 12.723 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 109709
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-02-07 03:27:04 ± 0.524
Latitude 41.8900 ± 0.0278
Longitude 12.7230 ± 0.0269
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 109709

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) 3807.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 268
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
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) 0.00065
Epicentral distance of station farthest from the epicenter (degree) 0.00745
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 109709
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:42:02

ML:1.6

Field Value
Value 1.6
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 109709
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. 1990-02-07T03:27:32.54 10.0 undecidable manual SG 102 0.8214 -0.15 0.5
--.SDI.Z. 1990-02-07T03:27:19.90 10.0 undecidable manual PG 102 0.8214 -0.72 0.4
--.CP9.Z. 1990-02-07T03:27:12.12 10.0 undecidable manual SG 99 0.1665 0.51 0.5
--.RDP.Z. 1990-02-07T03:27:10.23 10.0 undecidable manual SG 181 0.1221 -0.03 0.9
--.RDP.Z. 1990-02-07T03:27:08.18 10.0 undecidable manual PG 181 0.1221 0.51 1.3
--.CP9.Z. 1990-02-07T03:27:08.84 10.0 undecidable manual PG 99 0.1665 0.39 1.7
--.RMP.Z. 1990-02-07T03:27:07.96 10.0 undecidable manual SG 190 0.0666 -0.8 0.2
--.RMP.Z. 1990-02-07T03:27:06.81 10.0 undecidable manual PG 190 0.0666 0 2.4
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