Earthquake with magnitude of ML 2.1 on date 08-12-2021 and time 06:31:26 (UTC) in region 5 km N Colonna (RM)

A magnitude ML 2.1 earthquake occured in region: 5 km N Colonna (RM), on

  • 08-12-2021 06:31:26 (UTC)
  • 08-12-2021 07:31:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.881, 12.747 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

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 5 4287 4287
Gallicano nel Lazio RM 6 6334 10621
Monte Porzio Catone RM 8 8693 19314
San Cesareo RM 8 15153 34467
Monte Compatri RM 8 11978 46445
Zagarolo RM 8 17843 64288
Rocca Priora RM 10 11962 76250
Frascati RM 10 22087 98337
Tivoli RM 10 56533 154870
San Gregorio da Sassola RM 11 1619 156489
Casape RM 12 744 157233
Grottaferrata RM 12 20327 177560
Poli RM 12 2418 179978
Palestrina RM 13 21672 201650
Castel San Pietro Romano RM 13 902 202552
Guidonia Montecelio RM 13 88673 291225
Rocca di Papa RM 14 17034 308259
Marino RM 14 43026 351285
Castel Madama RM 15 7399 358684
Ciampino RM 15 38412 397096
Labico RM 16 6379 403475
San Polo dei Cavalieri RM 17 2992 406467
Fonte Nuova RM 17 32562 439029
Marcellina RM 17 7280 446309
Castel Gandolfo RM 17 8997 455306
Cave RM 17 11287 466593
Rocca di Cave RM 17 377 466970
Capranica Prenestina RM 17 351 467321
Sant'Angelo Romano RM 17 5018 472339
Pisoniano RM 18 770 473109
Nemi RM 18 1943 475052
Albano Laziale RM 18 41715 516767
Valmontone RM 18 15959 532726
Lariano RM 18 13432 546158
Ciciliano RM 19 1336 547494
Ariccia RM 19 19407 566901
Vicovaro RM 19 4019 570920
Mentana RM 19 22921 593841
Genazzano RM 20 6036 599877
San Vito Romano RM 20 3273 603150
Sambuci RM 20 925 604075
Genzano di Roma RM 20 23970 628045

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SW of Tivoli (56533 inhabitants)
13 Km S of Guidonia Montecelio (88673 inhabitants)
22 Km N of Velletri (53303 inhabitants)
22 Km E of Roma (2864731 inhabitants)
31 Km NE of Pomezia (62966 inhabitants)
33 Km N of Aprilia (73446 inhabitants)
44 Km E of Fiumicino (78395 inhabitants)
48 Km N of Latina (125985 inhabitants)
49 Km N of Anzio (54211 inhabitants)
75 Km SW of L'Aquila (69753 inhabitants)
76 Km S of Terni (111501 inhabitants)
80 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 2.1 2021-12-08
06:31:26
41.8812 12.7473 11 2021-12-08
06:39:36
Sala Sismica INGV-Roma 98275971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-08 06:31:26 ± 0.09
Latitude 41.8812 ± 0.0045
Longitude 12.7473 ± 0.0097
Depth (km) 11 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98275971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 641
Semi-minor axis of confidence ellipse (meter) 564
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 283
Circular confidence region, given by single value of horizontal uncertainty (meter) 640
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.49732
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 10
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 98275971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-08 06:39:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.CANO.HHZ. 2021-12-08T06:33:01.48 3.0 undecidable manual Sn -3.06 0
AC.VLO.HHZ. 2021-12-08T06:32:53.11 3.0 undecidable manual Pn 8.7 0
IV.ESCV.HHZ. 2021-12-08T06:32:35.13 3.0 negative manual Pn 4.24 0
IV.SNAL.HHZ. 2021-12-08T06:32:30.00 3.0 undecidable manual Sn 0.71 0
IV.IMOL.HNZ. 2021-12-08T06:32:30.47 3.0 undecidable manual Sn -1.67 0
IX.SSB3.HHZ.02 2021-12-08T06:32:27.86 3.0 undecidable manual Sn -0.22 0
GU.GENL.EHZ. 2021-12-08T06:32:21.00 3.0 positive manual Pn 4.8 0
MN.TRI.HHZ. 2021-12-08T06:32:19.68 3.0 positive manual Pn -1.86 0
IV.CELB.HHZ. 2021-12-08T06:32:19.01 3.0 undecidable manual Sg 3.09 0
IV.MML1.EHZ. 2021-12-08T06:32:01.05 3.0 undecidable manual S -1.45 0
IV.NRCA.HHZ. 2021-12-08T06:31:58.07 3.0 undecidable manual S 0.62 0
IV.CPGN.EHZ. 2021-12-08T06:31:55.61 3.0 undecidable manual Pn 2.02 0
IV.PP3.EHZ. 2021-12-08T06:31:50.10 3.0 negative manual Pn -1.24 0
IV.MNTT.EHZ. 2021-12-08T06:31:49.31 3.0 positive manual P 1.58 0
IV.LATB.EHE. 2021-12-08T06:31:41.32 0.6 undecidable manual S 157 0.4191 90 0.17 45
IV.GIUL.HHZ. 2021-12-08T06:31:35.88 1.0 positive manual P 130 0.4973 90 -0.32 22
IV.LATB.EHE. 2021-12-08T06:31:34.58 0.1 undecidable manual P 157 0.4191 90 -0.29 89
IV.CERT.HHZ. 2021-12-08T06:31:34.04 0.6 undecidable manual S 69 0.1871 92 -0.24 47
IV.RDP.HHZ. 2021-12-08T06:31:33.24 0.6 undecidable manual S 193 0.1241 102 0.82 39
IV.MTCE.HHZ. 2021-12-08T06:31:33.10 0.6 undecidable manual S 358 0.1412 96 0.17 49
IV.RCAV.EHZ. 2021-12-08T06:31:33.22 0.6 undecidable manual S 103 0.1511 94 0 49
IV.VIVA.HHZ. 2021-12-08T06:31:32.70 0.6 undecidable manual S 173 0.1322 99 0.05 49
IV.CERT.HHZ. 2021-12-08T06:31:31.08 0.3 undecidable manual P 69 0.1871 92 0.18 71
IV.LAV9.HHZ. 2021-12-08T06:31:31.22 0.1 undecidable manual P 190 0.2068 92 -0.01 98
IV.RMP.HHZ. 2021-12-08T06:31:30.75 0.6 undecidable manual S 205 0.0764 130 -0.41 46
IV.RCAV.EHZ. 2021-12-08T06:31:30.22 0.1 undecidable manual P 103 0.1511 94 -0.06 98
IV.MTCE.HHZ. 2021-12-08T06:31:30.35 0.1 negative manual P 358 0.1412 96 0.23 96
IV.SAMA.EHZ. 2021-12-08T06:31:30.20 0.1 undecidable manual P 229 0.1529 94 -0.12 97
IV.RMP.HHZ. 2021-12-08T06:31:29.06 0.1 negative manual P 205 0.0764 130 -0.04 100
IV.RDP.HHZ. 2021-12-08T06:31:29.93 0.6 undecidable manual P 193 0.1241 102 0.11 49
IV.VIVA.HHZ. 2021-12-08T06:31:29.93 0.3 negative manual P 173 0.1322 99 -0.03 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RMP.HHE. ML:2.6 0.005305 1.5 AML other m 2021-12-08T06:31:31.91
IV.RMP.HHN. ML:2.7 0.00665 0.24 AML other m 2021-12-08T06:31:33.18
IV.MTCE.HHN. ML:1.7 0.000398 0.34 AML other m 2021-12-08T06:31:33.59
IV.MTCE.HHE. ML:1.6 0.0003365 0.34 AML other m 2021-12-08T06:31:33.73
IV.RDP.HHE. ML:2.2 0.00155 0.82 AML other m 2021-12-08T06:31:34.16
IV.VIVA.HHE. ML:2.3 0.00189 0.36 AML other m 2021-12-08T06:31:34.41
IV.CERT.HHN. ML:1.6 0.000247 0.26 AML other m 2021-12-08T06:31:34.83
IV.RDP.HHN. ML:2.3 0.001885 0.96 AML other m 2021-12-08T06:31:35.32
IV.CERT.HHE. ML:1.2 0.0001115 0.36 AML other m 2021-12-08T06:31:36.79
IV.VIVA.HHN. ML:2.4 0.00239 1.66 AML other m 2021-12-08T06:31:36.05
IV.LAV9.HHE. ML:2.2 0.000907 0.4 AML other m 2021-12-08T06:31:41.12
IV.LAV9.HHN. ML:2.1 0.000772 0.8 AML other m 2021-12-08T06:31:42.44
IV.MNTT.EHN. ML:2.6 0.000206 0.46 AML other m 2021-12-08T06:32:14.93
IV.IMOL.HNN. ML:3.9 0.001075 0.24 AML other m 2021-12-08T06:32:31.53
IV.IMOL.HNE. ML:3.9 0.001125 0.06 AML other m 2021-12-08T06:32:32.61
IV.MNTT.EHE. ML:2.6 0.000197 1.4 AML other m 2021-12-08T06:32:35.75
IV.CPGN.EHN. ML:2.6 0.00011715 0.42 AML other m 2021-12-08T06:32:44.91
IV.CPGN.EHE. ML:2.6 9.435E-5 0.42 AML other m 2021-12-08T06:32:45.29
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, http://terremoti.ingv.it/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
Waveforms Seismic signals in miniseed + resp format Download