Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.0 on date 01-11-1999 and time 00:20:05 (Italy) in region 6 km N Colonna (RM)

A magnitude Md 3.0 earthquake occured in region: 6 km N Colonna (RM), on

  • 31-10-1999 23:20:05 (UTC)
  • 01-11-1999 00:20:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.8900, 12.7530 at 5 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 6 4287 4287
Gallicano nel Lazio RM 6 6334 10621
Zagarolo RM 8 17843 28464
San Cesareo RM 9 15153 43617
Monte Porzio Catone RM 9 8693 52310
Monte Compatri RM 9 11978 64288
Tivoli RM 9 56533 120821
San Gregorio da Sassola RM 11 1619 122440
Rocca Priora RM 11 11962 134402
Frascati RM 11 22087 156489
Casape RM 11 744 157233
Poli RM 12 2418 159651
Guidonia Montecelio RM 13 88673 248324
Palestrina RM 13 21672 269996
Castel San Pietro Romano RM 13 902 270898
Grottaferrata RM 13 20327 291225
Castel Madama RM 14 7399 298624
Rocca di Papa RM 15 17034 315658
Marino RM 15 43026 358684
San Polo dei Cavalieri RM 16 2992 361676
Marcellina RM 16 7280 368956
Ciampino RM 16 38412 407368
Labico RM 16 6379 413747
Fonte Nuova RM 16 32562 446309
Sant'Angelo Romano RM 16 5018 451327
Rocca di Cave RM 17 377 451704
Capranica Prenestina RM 17 351 452055
Cave RM 17 11287 463342
Pisoniano RM 17 770 464112
Ciciliano RM 18 1336 465448
Castel Gandolfo RM 18 8997 474445
Vicovaro RM 18 4019 478464
Valmontone RM 19 15959 494423
Mentana RM 19 22921 517344
Sambuci RM 19 925 518269
Nemi RM 19 1943 520212
Lariano RM 19 13432 533644
San Vito Romano RM 19 3273 536917
Genazzano RM 19 6036 542953
Albano Laziale RM 19 41715 584668
Palombara Sabina RM 20 13269 597937
Ariccia RM 20 19407 617344

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SW of Tivoli (56533 inhabitants)
13 Km S of Guidonia Montecelio (88673 inhabitants)
22 Km E of Roma (2864731 inhabitants)
23 Km N of Velletri (53303 inhabitants)
32 Km NE of Pomezia (62966 inhabitants)
34 Km N of Aprilia (73446 inhabitants)
45 Km E of Fiumicino (78395 inhabitants)
49 Km N of Latina (125985 inhabitants)
50 Km N of Anzio (54211 inhabitants)
74 Km SW of L'Aquila (69753 inhabitants)
75 Km S of Terni (111501 inhabitants)
79 Km SE of Viterbo (67173 inhabitants)
82 Km E of Civitavecchia (52991 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		Md 3.0 1999-10-31
23:20:05		 41.89 12.753 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 376479
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-10-31 23:20:05 ± 0.202
Latitude 41.8900 ± 0.0098
Longitude 12.7530 ± 0.0178
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 376479

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) 1835.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 162
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00113
Epicentral distance of station farthest from the epicenter (degree) 0.01506
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

Md:3.0

Field Value
Value 3.0
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 376479
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:53:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SNTG.Z. 1999-10-31T23:20:50.10 10.0 undecidable manual SN 5 1.3653 -0.24 0.6
--.ASS.Z. 1999-10-31T23:20:46.00 10.0 undecidable manual SN 356 1.1655 0.43 0.6
--.RVI2.Z. 1999-10-31T23:20:39.86 10.0 undecidable manual SG 105 0.9768 -0.37 0.8
--.PSB1.Z. 1999-10-31T23:20:36.62 10.0 undecidable manual PN 112 1.6761 0.94 0.7
--.ARV.Z. 1999-10-31T23:20:35.69 10.0 undecidable manual PN 4 1.6095 0.88 0.8
--.SDI.Z. 1999-10-31T23:20:33.94 10.0 undecidable manual SG 102 0.7992 -0.7 0.6
--.MAB1.Z. 1999-10-31T23:20:33.61 10.0 undecidable manual PN 115 1.443 1.08 0.6
--.SNTG.Z. 1999-10-31T23:20:32.50 10.0 undecidable manual PN 5 1.3653 0.57 1.3
--.AQU.Z. 1999-10-31T23:20:30.50 10.0 undecidable manual SG 45 0.666 0.38 0.7
--.CRVI.Z. 1999-10-31T23:20:29.00 10.0 undecidable manual PN 97 1.1544 0.3 1.7
--.ASS.Z. 1999-10-31T23:20:28.50 10.0 undecidable manual PN 356 1.1655 -0.73 1.1
--.RFI.Z. 1999-10-31T23:20:28.54 10.0 undecidable manual PN 122 1.0878 0.88 1
--.RNI2.Z. 1999-10-31T23:20:27.59 10.0 undecidable manual PG 99 1.0545 0.48 1.5
--.PQ9.Z. 1999-10-31T23:20:24.90 10.0 undecidable manual SG 74 0.4995 0.2 0.8
--.RVI2.Z. 1999-10-31T23:20:24.42 10.0 undecidable manual PG 105 0.9768 -1.26 0.5
--.MNS.Z. 1999-10-31T23:20:24.73 10.0 undecidable manual SG 353 0.4995 0.09 0.8
--.SDI.Z. 1999-10-31T23:20:21.17 10.0 undecidable manual PG 102 0.7992 -1.28 0.5
--.AQU.Z. 1999-10-31T23:20:19.42 10.0 undecidable manual PG 45 0.666 -0.43 1.8
--.PQ9.Z. 1999-10-31T23:20:16.52 10.0 undecidable manual PG 74 0.4995 -0.2 2.1
--.MNS.Z. 1999-10-31T23:20:15.66 10.0 undecidable manual PG 353 0.4995 -1.03 0.8
--.RDP.Z. 1999-10-31T23:20:10.99 10.0 undecidable manual SG 191 0.1221 -0.3 0.7
--.RDP.Z. 1999-10-31T23:20:08.83 10.0 undecidable manual PG 191 0.1221 -0.15 2
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols 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