Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.7 on date 31-12-2020 and time 20:06:43 (UTC) in region 4 km NE Ragalna (CT)

A magnitude ML 2.7 earthquake occured in region: 4 km NE Ragalna (CT), on

  • 31-12-2020 20:06:43 (UTC)
  • 31-12-2020 21:06:43 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6690, 14.9560 at 15 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
Ragalna CT 4 3924 3924
Biancavilla CT 8 24007 27931
Santa Maria di Licodia CT 8 7641 35572
Nicolosi CT 9 7463 43035
Belpasso CT 9 28108 71143
Pedara CT 11 14102 85245
Adrano CT 11 36122 121367
Paternò CT 11 48228 169595
Camporotondo Etneo CT 12 5023 174618
Trecastagni CT 12 10910 185528
San Pietro Clarenza CT 12 7743 193271
Zafferana Etnea CT 13 9517 202788
Mascalucia CT 14 31958 234746
Viagrande CT 14 8563 243309
Tremestieri Etneo CT 15 20589 263898
Gravina di Catania CT 15 25838 289736
Milo CT 15 1087 290823
Aci Bonaccorsi CT 16 3524 294347
San Giovanni la Punta CT 16 23060 317407
Sant'Agata li Battiati CT 16 9479 326886
Santa Venerina CT 16 8592 335478
Aci Sant'Antonio CT 17 17984 353462
Misterbianco CT 17 49410 402872
Bronte CT 17 19172 422044
Motta Sant'Anastasia CT 17 12116 434160
San Gregorio di Catania CT 18 11966 446126
Valverde CT 18 7840 453966
Aci Catena CT 18 29851 483817
Sant'Alfio CT 19 1582 485399
Acireale CT 20 52622 538021
Maletto CT 20 3920 541941
Centuripe EN 20 5470 547411

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km W of Acireale (52622 inhabitants)
22 Km NW of Catania (314555 inhabitants)
74 Km NW of Siracusa (122291 inhabitants)
78 Km SW of Reggio di Calabria (183035 inhabitants)
79 Km SW of Messina (238439 inhabitants)
81 Km E of Caltanissetta (63360 inhabitants)
85 Km N of Ragusa (73313 inhabitants)
88 Km NE of Vittoria (63339 inhabitants)
92 Km NE of Gela (75827 inhabitants)
92 Km N of Modica (54633 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 		ML 2.7 2020-12-31
20:06:43		 37.6687 14.9563 15 2021-02-26
14:56:20		 Bollettino Sismico Italiano INGV 87497971
Reviewed
Rev200 		ML 2.4 2020-12-31
20:06:43		 37.653 14.949 14 2021-02-26
09:22:29		 Sala Operativa INGV-OE (Catania) 85916321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 20:06:43 ± 0.09
Latitude 37.6687 ± 0.0045
Longitude 14.9563 ± 0.0102
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87497971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 687
Semi-minor axis of confidence ellipse (meter) 523
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 278
Circular confidence region, given by single value of horizontal uncertainty (meter) 690.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 43
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.02878
Epicentral distance of station farthest from the epicenter (degree) 0.96138
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:2.7

Field Value
Value 2.7
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 87497971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-26 09:22:01

ML:2.4

Field Value
Value 2.4
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 85916321
Agency INGV
Autore Sala Operativa INGV-OE (Catania)
Time of creation (UTC) 2020-12-31 20:43:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HPAC.HHZ. 2020-12-31T20:07:15.48 0.6 undecidable manual S 176 106.7154 93 0.81 34
IV.HAVL.HHZ. 2020-12-31T20:07:08.17 0.6 undecidable manual S 169 79.9644 94 0.64 38
IV.HMDC.HHZ. 2020-12-31T20:07:08.09 0.6 undecidable manual S 191 80.1642 94 0.51 40
IV.SSY.HHZ. 2020-12-31T20:07:02.37 0.6 undecidable manual S 170 57.5979 96 0.79 37
IV.HPAC.HHZ. 2020-12-31T20:07:01.28 0.3 undecidable manual P 176 106.7154 93 -0.29 59
IV.MSRU.HHZ. 2020-12-31T20:06:58.19 0.6 undecidable manual P 36 81.7515 94 0.45 40
IV.HAGA.HHZ. 2020-12-31T20:06:58.89 0.6 undecidable manual S 158 46.0206 97 0.39 44
IV.HCRL.HHZ. 2020-12-31T20:06:58.10 0.6 undecidable manual S 171 43.3233 98 0.32 45
IV.HAVL.HHZ. 2020-12-31T20:06:57.07 0.1 undecidable manual P 169 79.9644 94 -0.39 81
IV.HMDC.HHZ. 2020-12-31T20:06:57.24 0.3 undecidable manual P 191 80.1642 94 -0.24 63
IV.RAFF.HHZ. 2020-12-31T20:06:56.01 0.3 undecidable manual P 227 71.9724 94 -0.22 64
IV.MPNC.HHZ. 2020-12-31T20:06:54.71 0.3 undecidable manual P 33 63.3921 95 -0.19 66
IV.SSY.HHZ. 2020-12-31T20:06:53.87 0.1 undecidable manual P 170 57.5979 96 -0.15 89
IV.MSFR.HHZ. 2020-12-31T20:06:53.81 0.3 undecidable manual P 322 51.6039 96 0.72 58
IV.HAGA.HHZ. 2020-12-31T20:06:51.85 0.3 undecidable manual P 158 46.0206 97 -0.39 65
IV.EMSG.HHZ. 2020-12-31T20:06:51.98 0.6 undecidable manual S 358 16.872 121 0.94 37
IV.HCRL.HHZ. 2020-12-31T20:06:51.34 0.3 undecidable manual P 171 43.3233 98 -0.48 64
IV.EPZF.HHZ. 2020-12-31T20:06:51.44 0.6 undecidable manual S 333 19.2696 116 -0.17 48
IV.EPIT.HHN. 2020-12-31T20:06:51.87 0.6 undecidable manual S 29 18.0708 119 0.55 44
IV.MUCR.HHZ. 2020-12-31T20:06:51.66 0.1 undecidable manual P 350 42.1245 98 0 95
IV.AIO.HHZ. 2020-12-31T20:06:51.28 0.3 undecidable manual P 36 41.4252 99 -0.26 67
IV.EVRN.HNN. 2020-12-31T20:06:51.09 0.6 undecidable manual S 82 15.873 123 0.28 47
IV.GALF.HHZ. 2020-12-31T20:06:50.79 0.3 undecidable manual P 278 34.5432 101 0.29 68
IV.ENIC.HHZ. 2020-12-31T20:06:50.00 0.6 undecidable manual S 126 7.0929 150 0.82 39
IV.ECBD.HHN. 2020-12-31T20:06:50.24 0.6 undecidable manual S 43 16.872 121 -0.78 40
IV.EMCN.HHZ. 2020-12-31T20:06:50.73 0.6 undecidable manual S 26 15.1737 125 0.07 49
IV.ECTS.HHZ. 2020-12-31T20:06:49.50 0.3 undecidable manual P 31 27.75 106 0.03 73
IV.EFIU.HHE. 2020-12-31T20:06:49.51 0.6 undecidable manual P 59 26.0517 107 0.29 46
IV.ESML.HHZ. 2020-12-31T20:06:49.28 0.6 undecidable manual S 230 8.7801 144 -0.15 50
IV.ECHR.HHE. 2020-12-31T20:06:49.30 0.6 undecidable manual S 297 4.2957 161 0.42 45
IV.EPOZ.HHZ. 2020-12-31T20:06:48.85 0.1 undecidable manual P 89 20.3685 114 0.44 90
IV.EMSG.HHZ. 2020-12-31T20:06:48.01 0.1 negative manual P 358 16.872 121 0.08 98
IV.ESLN.HHZ. 2020-12-31T20:06:48.97 0.6 undecidable manual S 30 3.1968 166 0.18 48
IV.EPIT.HHN. 2020-12-31T20:06:48.25 0.1 undecidable manual P 29 18.0708 119 0.16 96
IV.EPZF.HHZ. 2020-12-31T20:06:48.11 0.1 undecidable manual P 333 19.2696 116 -0.15 96
IV.EVRN.HNN. 2020-12-31T20:06:47.34 0.3 undecidable manual P 82 15.873 123 -0.46 68
IV.EMCN.HHZ. 2020-12-31T20:06:47.55 0.3 undecidable manual P 26 15.1737 125 -0.17 72
IV.ECBD.HHN. 2020-12-31T20:06:47.55 0.1 undecidable manual P 43 16.872 121 -0.38 92
IV.ESLN.HHZ. 2020-12-31T20:06:46.45 0.1 positive manual P 30 3.1968 166 -0.18 99
IV.ECHR.HHE. 2020-12-31T20:06:46.29 0.1 undecidable manual P 297 4.2957 161 -0.39 94
IV.ENIC.HHZ. 2020-12-31T20:06:46.88 0.1 undecidable manual P 126 7.0929 150 0.03 100
IV.ECPN.HHZ. 2020-12-31T20:06:46.88 0.3 undecidable manual P 18 8.7801 144 -0.12 74
IV.ESML.HHZ. 2020-12-31T20:06:46.36 0.1 negative manual P 230 8.7801 144 -0.64 87
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESLN.HHN. ML:2.8 0.006615 0.32 AML other m 2020-12-31T20:06:49.28
IV.ESLN.HHE. ML:2.8 0.0066 0.28 AML other m 2020-12-31T20:06:49.44
IV.ESML.HHN. ML:2.6 0.0036900000000000006 0.88 AML other m 2020-12-31T20:06:49.46
IV.ESML.HHE. ML:2.6 0.003905 1.2 AML other m 2020-12-31T20:06:49.91
IV.ENIC.HNN. ML:3.0 0.01008 1.06 AML other m 2020-12-31T20:06:50.73
IV.ENIC.HHN. ML:2.9 0.007574999999999999 1.2 AML other m 2020-12-31T20:06:50.20
IV.ENIC.HHE. ML:2.9 0.008469999999999998 0.32 AML other m 2020-12-31T20:06:51.17
IV.ENIC.HNE. ML:2.9 0.009105 1.22 AML other m 2020-12-31T20:06:51.18
IV.EMSG.HHN. ML:3.0 0.007175000000000001 0.5 AML other m 2020-12-31T20:06:52.46
IV.EMSG.HHE. ML:2.8 0.004285 1.12 AML other m 2020-12-31T20:06:52.01
IV.EPZF.HHN. ML:2.8 0.00395 0.44 AML other m 2020-12-31T20:06:54.24
IV.EPZF.HHE. ML:2.7 0.0036349999999999998 0.34 AML other m 2020-12-31T20:06:55.25
IV.HCRL.HHE. ML:2.6 0.00127 0.3 AML other m 2020-12-31T20:06:58.41
IV.AIO.HHN. ML:2.1 0.000435 0.88 AML other m 2020-12-31T20:06:58.96
IV.HAGA.HHE. ML:2.8 0.0017599999999999998 0.36 AML other m 2020-12-31T20:06:59.29
IV.HAGA.HHN. ML:2.5 0.000874 0.3 AML other m 2020-12-31T20:06:59.31
IV.HCRL.HHN. ML:2.6 0.001175 0.76 AML other m 2020-12-31T20:06:59.16
IV.MUCR.HHE. ML:2.4 0.0007905 0.32 AML other m 2020-12-31T20:06:59.85
IV.AIO.HHE. ML:2.2 0.000524 0.32 AML other m 2020-12-31T20:07:00.42
IV.MUCR.HHN. ML:2.3 0.0006835 0.44 AML other m 2020-12-31T20:07:01.38
IV.SSY.HHE. ML:3.4 0.00557 0.32 AML other m 2020-12-31T20:07:02.64
IV.GALF.HHN. ML:2.8 0.002195 0.68 AML other m 2020-12-31T20:07:03.72
IV.GALF.HHE. ML:2.8 0.002445 0.42 AML other m 2020-12-31T20:07:05.51
IV.SSY.HHN. ML:3.5 0.006715 0.5 AML other m 2020-12-31T20:07:05.60
IV.MPNC.HHE. ML:2.5 0.0005650000000000001 1.16 AML other m 2020-12-31T20:07:08.72
IV.HAVL.HHE. ML:3.1 0.001585 0.6 AML other m 2020-12-31T20:07:08.97
IV.HAVL.HHN. ML:3.2 0.0020350000000000004 0.24 AML other m 2020-12-31T20:07:09.40
IV.HMDC.HHE. ML:2.8 0.000803 0.28 AML other m 2020-12-31T20:07:10.59
IV.HMDC.HNE. ML:2.7 0.0007895 0.36 AML other m 2020-12-31T20:07:10.59
IV.MPNC.HHN. ML:2.5 0.000616 0.64 AML other m 2020-12-31T20:07:11.63
IV.HMDC.HHN. ML:2.7 0.000693 1.2 AML other m 2020-12-31T20:07:12.03
IV.HMDC.HNN. ML:2.7 0.0006580000000000001 1.18 AML other m 2020-12-31T20:07:12.04
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
Waveforms Seismic signals in miniseed + resp format Download