INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Mw 4.6 on date 06-10-2018 and time 02:34:20 (Italy) in region 1 km S Biancavilla (CT)

A magnitude Mw 4.6 earthquake occured in region: 1 km S Biancavilla (CT), on

  • 06-10-2018 00:34:20 (UTC)
  • 06-10-2018 02:34:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.63, 14.88 at 6 km depth.

The earthquake was located by: Sala Operativa INGV-OE (Catania).

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 1 24007 24007
Santa Maria di Licodia CT 2 7641 31648
Adrano CT 5 36122 67770
Ragalna CT 6 3924 71694
Paternò CT 6 48228 119922
Belpasso CT 10 28108 148030
Centuripe EN 12 5470 153500
Camporotondo Etneo CT 14 5023 158523
Nicolosi CT 14 7463 165986
San Pietro Clarenza CT 15 7743 173729
Motta Sant'Anastasia CT 16 12116 185845
Pedara CT 16 14102 199947
Misterbianco CT 17 49410 249357
Mascalucia CT 17 31958 281315
Catenanuova EN 18 4866 286181
Bronte CT 18 19172 305353
Trecastagni CT 18 10910 316263
Gravina di Catania CT 18 25838 342101
Tremestieri Etneo CT 18 20589 362690
Viagrande CT 20 8563 371253
Sant'Agata li Battiati CT 20 9479 380732

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of Catania (314555 inhabitants)
26 Km W of Acireale (52622 inhabitants)
73 Km E of Caltanissetta (63360 inhabitants)
73 Km NW of Siracusa (122291 inhabitants)
79 Km N of Ragusa (73313 inhabitants)
81 Km NE of Vittoria (63339 inhabitants)
84 Km NE of Gela (75827 inhabitants)
86 Km SW of Reggio di Calabria (183035 inhabitants)
86 Km N of Modica (54633 inhabitants)
87 Km SW of Messina (238439 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.
Earthquakes since 1000 AD until 2014

Earthquakes since 1000 AD until 2014 *

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. 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

These three maps show the results of the analysis using the software ShakeMap designed to provide the level of ground shaking experienced in a region using the data recorded by seismometers and strong motion instruments and seismological information regarding the attenuation of the wavefield with distance and the site characteristics. The Shakemaps are determined for research purposes to provide fast estimates of the level of ground shaking produced by the earthquake. The maps are calculated automatically and adjourned progressively as more data become available. See http://shakemap.rm.ingv.it/ for additional information.

The red star indicates the epicenter. The red triangles show the stations of the INGV Italian National Seismic Network and the blue triangles those of the Nationa Accelerometric Network of the Dipartimento della Protezione Civile.

Intensity Shakemap

Intensity Shakemap *

This map shows the distribution of the istrumentally derived intensities. To this purpose, it is used a conversion relation between ground acceleration and velocity, and the Mercalli Modificata (MMI - Modified Mercalli Intensity) scale. In general, the Mercalli intensity scale relies on the effects that the ground shaking produces as reported by an observer.
Peak ground acceleration Shakemap

Peak ground acceleration Shakemap *

This map shows This map shows the distribution of peak ground acceleration expressed as per cent of the acceleration of gravity (i.e., g = 9.81 m/s²).
Peak velocity Shakemap

Peak velocity Shakemap *

This map shows the distribution of peak ground velocities expressed in cm/s.
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 Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 200 ML 4.8 2018-10-06
00:34:20
37.63 14.88 6 2018-10-06
08:02:40
Sala Operativa INGV-OE (Catania) 61665181
Rev 501 Mw 4.6 2018-10-06
00:34:20
37.6 14.89 6 2018-10-06
06:24:23
TDMT-INGV Revised 61662081
Rev 200 ML 4.8 2018-10-06
00:34:20
37.6 14.89 9 2018-10-06
05:56:31
Sala Operativa INGV-OE (Catania) 61661441
Rev 200 ML 4.8 2018-10-06
00:34:20
37.6 14.89 9 2018-10-06
01:12:34
Sala Sismica INGV-Roma 61657031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-10-06 00:34:20 ± 0
Latitude 37.63
Longitude 14.88
Depth (km) 6 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 200 -> SURVEY-INGV-CT
Event type earthquake
Origin ID 61665181

Uncertainty

Field Value
Preferred uncertainty description
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) 0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree)
Number of associated phases, regardless of their use for origin computation 1
Number of defining phases 1
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0
Epicentral distance of station closest to the epicenter (degree)
Epicentral distance of station farthest from the epicenter (degree)
Number of stations at which the event was observed 0
Number of stations from which data was used for origin computation 0
Magnitudes information

Mw:4.6

Field Value
Value 4.6
Uncertainty
Num. used stations
Type of magnitude Mw
Reference to an origin 61662081
Agency INGV
Autore TDMT-INGV Revised
Time of creation (UTC) 2018-10-06 06:24:23

ML:4.8

Field Value
Value 4.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 61661441
Agency INGV
Autore Sala Operativa INGV-OE (Catania)
Time of creation (UTC) 2018-10-06 05:56:31

ML:4.8

Field Value
Value 4.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 61657031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-10-06 01:12:34

ML:4.8

Field Value
Value 4.8
Uncertainty 0
Num. used stations
Type of magnitude ML
Reference to an origin 61665181
Agency INGV
Autore Sala Operativa INGV-OE (Catania)
Time of creation (UTC) 2018-10-06 08:02:40
TDMT - Time Domain Moment Tensor

TDMT details

Field Value
Magnitude4.6
Scalar Moment9.67459E+22 dyne-cm
Computed depth6 km
QualityBa
Variance Reduction31.36%
Double Couple98%
CLVD2%
ISO0%
Model usedCIA
Modemanual
Statusreviewed

Moment Tensor Components

Component Value
Mrr-4.3616E+21
Mtt-9.9187E+21
Mpp1.42803E+22
Mrt8.3041E+21
Mrp-2.14551E+22
Mtp9.31155E+22

Nodal Planes

Name Strike Dip Rake
PN135785-167
PN226677-5

Focal Mechanism

Focal Mechanism

psmeca (GMT documentation)

14.893 37.598 6 357 85 -167 266 77 -5 9.67459 22 15.393 38.098

TDMT references

More info and references

Station Distribution

Station Distribution

TDMT station details

Sta Dist Azi V R zcor
IACL 114 335.7 22.95% 104
IVGP 88.9 3.8 37.78% 101
IVPL 86.7 5 37.36% 101
MUCR 49.4 358.1 55.53% 97
NOV 52.4 24 30.68% 97
HPAC 99.5 172.6 46.45% 104
PETRA 73.4 291.1 31.93% 101
CSLB 82.7 297.4 27.42% 101
CEL 114.7 49.8 5.16% 106
IST3 136.6 12.4 19.52% 107
RAFF 62.8 228.6 7.97% 97
CROCE 90.7 200.6 26.73% 102
HMDC 71.6 187.9 36.95% 100
SSY 51.4 161.8 35.63% 98
HAGA 41.8 146.2 35.11% 97
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