Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.3 on date 16-02-1999 and time 23:57:36 (Italy) in region 2 km N Tivoli (RM)

A magnitude Md 3.3 earthquake occured in region: 2 km N Tivoli (RM), on

  • 16-02-1999 22:57:36 (UTC)
  • 16-02-1999 23:57:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.9830, 12.7920 at 2 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
Tivoli RM 2 56533 56533
Marcellina RM 5 7280 63813
San Polo dei Cavalieri RM 5 2992 66805
Guidonia Montecelio RM 6 88673 155478
Castel Madama RM 6 7399 162877
Sant'Angelo Romano RM 9 5018 167895
Vicovaro RM 9 4019 171914
Palombara Sabina RM 10 13269 185183
San Gregorio da Sassola RM 10 1619 186802
Casape RM 12 744 187546
Roccagiovine RM 12 263 187809
Sambuci RM 12 925 188734
Mandela RM 12 917 189651
Gallicano nel Lazio RM 13 6334 195985
Ciciliano RM 13 1336 197321
Saracinesco RM 14 185 197506
Poli RM 14 2418 199924
Licenza RM 14 1011 200935
Mentana RM 14 22921 223856
Fonte Nuova RM 14 32562 256418
Monteflavio RM 15 1348 257766
Moricone RM 15 2650 260416
Percile RM 16 255 260671
Pisoniano RM 16 770 261441
Zagarolo RM 16 17843 279284
Cineto Romano RM 16 601 279885
Cerreto Laziale RM 16 1118 281003
Monterotondo RM 16 40830 321833
Anticoli Corrado RM 17 915 322748
Colonna RM 17 4287 327035
Montorio Romano RM 17 1984 329019
Castel San Pietro Romano RM 17 902 329921
Roviano RM 18 1351 331272
Montelibretti RM 18 5323 336595
Gerano RM 18 1263 337858
Palestrina RM 18 21672 359530
San Cesareo RM 18 15153 374683
Marano Equo RM 19 779 375462
Capranica Prenestina RM 19 351 375813
Riofreddo RM 19 781 376594
San Vito Romano RM 19 3273 379867
Rocca Canterano RM 20 196 380063
Monte Porzio Catone RM 20 8693 388756
Monte Compatri RM 20 11978 400734
Arsoli RM 20 1586 402320
Rocca di Cave RM 20 377 402697
Agosta RM 20 1765 404462
Nerola RM 20 1926 406388

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km N of Tivoli (56533 inhabitants)
6 Km E of Guidonia Montecelio (88673 inhabitants)
27 Km E of Roma (2864731 inhabitants)
33 Km N of Velletri (53303 inhabitants)
42 Km NE of Pomezia (62966 inhabitants)
45 Km N of Aprilia (73446 inhabitants)
52 Km E of Fiumicino (78395 inhabitants)
58 Km N of Latina (125985 inhabitants)
61 Km N of Anzio (54211 inhabitants)
65 Km SW of L'Aquila (69753 inhabitants)
65 Km S of Terni (111501 inhabitants)
74 Km SE of Viterbo (67173 inhabitants)
83 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 3.3
ML-VAX 1.7 		1999-02-16
22:57:36		 41.983 12.792 3 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 359689
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1999-02-16 22:57:36 ± 0.196
Latitude 41.9830 ± 0.0106
Longitude 12.7920 ± 0.0194
Depth (km) 3 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 359689

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) 1985.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.01530
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 359689
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:37:16

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 359689
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
--.ASS.Z. 1999-02-16T22:58:15.77 10.0 undecidable manual SG 354 1.0767 1.41 0
--.RFI.Z. 1999-02-16T22:58:14.94 10.0 undecidable manual SN 126 1.11 -0.51 0.3
--.NRCA.Z. 1999-02-16T22:58:08.71 10.0 undecidable manual SG 15 0.8769 0.81 0.2
--.FB9.Z. 1999-02-16T22:58:07.26 10.0 undecidable manual PN 359 1.6983 0.34 0.7
--.MAB1.Z. 1999-02-16T22:58:04.83 10.0 undecidable manual PN 118 1.4541 1.25 0.1
--.SNTG.Z. 1999-02-16T22:58:00.75 10.0 undecidable manual PN 4 1.2654 -0.23 1
--.RFI.Z. 1999-02-16T22:57:58.39 10.0 undecidable manual PN 126 1.11 -0.48 0.8
--.ASS.Z. 1999-02-16T22:57:57.65 10.0 positive manual PG 354 1.0767 -0.6 1.3
--.PQ9.Z. 1999-02-16T22:57:53.48 10.0 undecidable manual SG 84 0.444 -0.26 0.5
--.NRCA.Z. 1999-02-16T22:57:53.55 10.0 undecidable manual PG 15 0.8769 -0.98 0.3
--.MNS.Z. 1999-02-16T22:57:53.50 10.0 undecidable manual SG 348 0.3996 1.46 0
--.AQU.Z. 1999-02-16T22:57:48.98 10.0 undecidable manual PG 50 0.5772 -0.02 1.4
--.PQ9.Z. 1999-02-16T22:57:46.47 10.0 negative manual PG 84 0.444 0.13 2.7
--.MNS.Z. 1999-02-16T22:57:45.29 10.0 negative manual PG 348 0.3996 -0.07 2.8
--.RDP.Z. 1999-02-16T22:57:45.84 10.0 undecidable manual SG 193 0.222 0.63 0.3
--.RMP.Z. 1999-02-16T22:57:44.21 10.0 undecidable manual SG 201 0.1776 0.8 0.2
--.RDP.Z. 1999-02-16T22:57:41.25 10.0 positive manual PG 193 0.222 -0.17 2.7
--.RMP.Z. 1999-02-16T22:57:40.17 10.0 negative manual PG 201 0.1776 -0.2 2.6
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