INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.1 on date 04-12-2017 and time 06:53:57 (Italy) in region 7 km NE Biancavilla (CT)

A magnitude ML 2.1 earthquake occured in region: 7 km NE Biancavilla (CT), on

  • 04-12-2017 05:53:57 (UTC)
  • 04-12-2017 06:53:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7, 14.91 at 26 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
Biancavilla CT 8 24007 24007
Ragalna CT 8 3924 27931
Adrano CT 8 36122 64053
Santa Maria di Licodia CT 10 7641 71694
Bronte CT 12 19172 90866
Belpasso CT 13 28108 118974
Paternò CT 14 48228 167202
Nicolosi CT 14 7463 174665
Maletto CT 15 3920 178585
Pedara CT 16 14102 192687
Zafferana Etnea CT 17 9517 202204
Camporotondo Etneo CT 17 5023 207227
San Pietro Clarenza CT 17 7743 214970
Trecastagni CT 17 10910 225880
Centuripe EN 18 5470 231350
Milo CT 18 1087 232437
Mascalucia CT 19 31958 264395
Viagrande CT 19 8563 272958
Tremestieri Etneo CT 20 20589 293547
Santa Venerina CT 20 8592 302139
Randazzo CT 20 10900 313039

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km W of Acireale (52622 inhabitants)
27 Km NW of Catania (314555 inhabitants)
79 Km E of Caltanissetta (63360 inhabitants)
79 Km NW of Siracusa (122291 inhabitants)
79 Km SW of Reggio di Calabria (183035 inhabitants)
79 Km SW of Messina (238439 inhabitants)
88 Km N of Ragusa (73313 inhabitants)
90 Km NE of Vittoria (63339 inhabitants)
92 Km NE of Gela (75827 inhabitants)
94 Km N of Modica (54633 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Date and Time (UTC) Latitude Longitude Magnitude Depth (km) Published time (UTC) Author Location ID
Rev 100 2017-12-04
05:53:57
37.7 14.91 ML 2.1 26 2017-12-04
06:15:07
Sala Sismica INGV-Roma 52327151
Best location and best magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-04 05:53:57 ± 0.09
Latitude 37.70 ± 0.00
Longitude 14.91 ± 0.01
Depth (km) 26 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 52327151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 530
Semi-minor axis of confidence ellipse (meter) 28
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 530
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.04856
Epicentral distance of station farthest from the epicenter (degree) 0.74824
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 52327151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-04 06:15:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MILZ.HHZ. 2017-12-04T05:54:10.23 0.1 undecidable manual P 24 0.6232 104 0.29 86
IV.SSY.HHZ. 2017-12-04T05:54:08.93 0.1 undecidable manual P 167 0.5567 106 0.08 91
IV.AGST.EHZ. 2017-12-04T05:54:07.91 0.1 undecidable manual P 151 0.5081 108 -0.15 90
IV.HAGA.HHZ. 2017-12-04T05:54:07.18 0.1 undecidable manual P 155 0.4569 110 -0.05 93
IV.NOV.HHZ. 2017-12-04T05:54:05.93 0.3 undecidable manual P 28 0.3714 116 0.05 71
IV.MSFR.HHN. 2017-12-04T05:54:06.84 0.1 undecidable manual P 323 0.4191 112 0.21 91
IV.AIO.HHZ. 2017-12-04T05:54:05.78 0.1 undecidable manual P 43 0.3696 116 -0.07 95
IV.MUCR.HHZ. 2017-12-04T05:54:05.21 0.1 undecidable manual P 355 0.3435 118 -0.25 92
IV.HLNI.HHZ. 2017-12-04T05:54:05.44 0.1 undecidable manual P 185 0.3534 117 -0.16 93
IV.HMDC.HHZ. 2017-12-04T05:54:11.95 0.1 undecidable manual P 188 0.7482 102 -0.08 87
IV.EPOZ.HHZ. 2017-12-04T05:54:03.89 0.1 undecidable manual P 97 0.2194 132 0.2 95
IV.EPZF.HHZ. 2017-12-04T05:54:02.28 0.1 undecidable manual P 340 0.1313 147 -0.43 92
IV.ESML.HHZ. 2017-12-04T05:54:02.42 0.1 undecidable manual P 198 0.0863 157 0.08 100
IV.GALF.HHZ. 2017-12-04T05:54:04.74 0.1 undecidable manual P 272 0.2752 124 0.3 92
IV.ESLN.HHZ. 2017-12-04T05:54:01.67 0.3 undecidable manual P 98 0.0486 167 -0.47 70
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSY.HHN. ML:2.4 0.0004825 0.42 AML other m 2017-12-04T05:54:23.86
IV.ESML.HHE. ML:2.1 0.0008195 1.4 AML other m 2017-12-04T05:54:07.12
IV.EPZF.HHN. ML:2.6 0.00192 0.74 AML other m 2017-12-04T05:54:08.49
IV.ESML.HHN. ML:2.1 0.0008325 0.42 AML other m 2017-12-04T05:54:11.41
IV.EPOZ.HHE. ML:2.2 0.000778 0.68 AML other m 2017-12-04T05:54:11.88
IV.EPOZ.HHN. ML:2.2 0.0007485 1.4 AML other m 2017-12-04T05:54:11.82
IV.GALF.HHE. ML:2.3 0.000763 0.36 AML other m 2017-12-04T05:54:12.41
IV.AIO.HHN. ML:2.1 0.000356 0.38 AML other m 2017-12-04T05:54:12.60
IV.AIO.HHE. ML:2.2 0.000393 0.26 AML other m 2017-12-04T05:54:12.48
IV.HLNI.HHE. ML:1.8 0.0001975 0.4 AML other m 2017-12-04T05:54:12.65
IV.HLNI.HHN. ML:1.7 0.000155 0.64 AML other m 2017-12-04T05:54:13.16
IV.MUCR.HHE. ML:1.8 0.0001985 0.42 AML other m 2017-12-04T05:54:14.18
IV.GALF.HHN. ML:2.2 0.000643 0.62 AML other m 2017-12-04T05:54:14.78
IV.HAGA.HHN. ML:2 0.0002055 0.9 AML other m 2017-12-04T05:54:17.08
IV.HAGA.HHE. ML:1.9 0.0001735 0.78 AML other m 2017-12-04T05:54:18.54
IV.MUCR.HHN. ML:1.8 0.000174 0.76 AML other m 2017-12-04T05:54:18.40
IV.SSY.HHE. ML:2.2 0.0002545 0.88 AML other m 2017-12-04T05:54:24.07
IV.HMDC.HHN. ML:2.1 0.00015846779 0 AML other m 2017-12-04T05:54:24.26
IV.HMDC.HHE. ML:2 0.00012525242 0.3 AML other m 2017-12-04T05:54:24.89
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol 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 full SEED format Download