Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.3 on date 27-10-1985 and time 07:29:36 (UTC) in region Costa Catanese (Catania)

A magnitude Md 3.3 earthquake occured in region: Costa Catanese (Catania), on

  • 27-10-1985 07:29:36 (UTC)
  • 27-10-1985 08:29:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6750, 15.2060 at 5 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
Santa Venerina CT 6 8592 8592
Riposto CT 6 14838 23430
Giarre CT 7 27659 51089
Acireale CT 8 52622 103711
Mascali CT 9 14282 117993
Zafferana Etnea CT 9 9517 127510
Sant'Alfio CT 10 1582 129092
Milo CT 10 1087 130179
Aci Catena CT 10 29851 160030
Aci Sant'Antonio CT 10 17984 178014
Viagrande CT 12 8563 186577
Aci Bonaccorsi CT 12 3524 190101
Valverde CT 13 7840 197941
Trecastagni CT 13 10910 208851
Fiumefreddo di Sicilia CT 13 9623 218474
Pedara CT 14 14102 232576
Aci Castello CT 14 18723 251299
San Giovanni la Punta CT 15 23060 274359
San Gregorio di Catania CT 15 11966 286325
Piedimonte Etneo CT 15 3963 290288
Tremestieri Etneo CT 16 20589 310877
Calatabiano CT 17 5308 316185
Sant'Agata li Battiati CT 17 9479 325664
Nicolosi CT 17 7463 333127
Mascalucia CT 18 31958 365085
Gravina di Catania CT 18 25838 390923
Linguaglossa CT 19 5403 396326
San Pietro Clarenza CT 20 7743 404069
Giardini-Naxos ME 20 9415 413484

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km NE of Acireale (52622 inhabitants)
22 Km NE of Catania (314555 inhabitants)
62 Km SW of Reggio di Calabria (183035 inhabitants)
66 Km SW of Messina (238439 inhabitants)
69 Km N of Siracusa (122291 inhabitants)
93 Km NE of Ragusa (73313 inhabitants)
99 Km NE of Modica (54633 inhabitants)
100 Km NE of Vittoria (63339 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 1985-10-27
07:29:36		 37.675 15.206 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 15049
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-10-27 07:29:36 ± 0.348
Latitude 37.6750 ± 0.0304
Longitude 15.2060 ± 0.0394
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 15049

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) 4843.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.9
Epicentral distance of station closest to the epicenter (degree) 0.00494
Epicentral distance of station farthest from the epicenter (degree) 0.07957
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitude information

Md:3.3

Field Value
Value 3.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 15049
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:17:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.RBL.Z. 1985-10-27T07:31:46.20 10.0 undecidable manual PN 352 8.8356 1.5 0.2
--.CTI.Z. 1985-10-27T07:31:44.30 10.0 undecidable manual PN 343 8.7579 0.54 0.6
--.PHP.Z. 1985-10-27T07:31:00.50 10.0 undecidable manual PN 43 5.6721 -0.78 0.7
--.SGO.Z. 1985-10-27T07:30:57.80 10.0 undecidable manual SN 1 2.8749 0.95 0.6
--.TIR.Z. 1985-10-27T07:30:52.50 10.0 undecidable manual PN 43 5.1171 -1.25 0.5
--.SD1.Z. 1985-10-27T07:30:41.00 10.0 positive manual PN 345 4.1625 0.45 2.1
--.DUI.Z. 1985-10-27T07:30:39.60 10.0 undecidable manual PN 352 4.0182 1.1 0.7
--.BAI.Z. 1985-10-27T07:30:33.50 10.0 undecidable manual PN 20 3.6519 -0.09 1.2
--.PE1.Z. 1985-10-27T07:30:31.40 10.0 undecidable manual PN 28 3.5631 -0.85 0.9
--.BRT.Z. 1985-10-27T07:30:31.10 10.0 undecidable manual PN 24 3.5187 -0.66 1
--.LCI.Z. 1985-10-27T07:30:30.60 10.0 undecidable manual PN 39 3.4743 -0.53 1.1
--.SGO.Z. 1985-10-27T07:30:21.80 10.0 negative manual PN 1 2.8749 -1.06 1.7
--.ORI.Z. 1985-10-27T07:30:18.70 10.0 undecidable manual PN 21 2.553 0.25 1.4
--.ROI.Z. 1985-10-27T07:30:14.60 10.0 undecidable manual PN 29 2.1645 1.49 0.5
--.MMN.Z. 1985-10-27T07:30:14.60 10.0 undecidable manual PN 15 2.2866 -0.2 1.4
--.DR2.Z. 1985-10-27T07:30:13.00 10.0 undecidable manual SN 30 1.1211 -2.01 0.1
--.ERC.Z. 1985-10-27T07:30:13.40 10.0 undecidable manual PN 280 2.0979 1.33 0.6
--.CV9.Z. 1985-10-27T07:30:10.70 10.0 undecidable manual PN 271 1.9092 1.21 0.7
--.GIB.Z. 1985-10-27T07:30:09.00 10.0 undecidable manual SG 289 0.9768 -1.85 0.2
--.CZI.Z. 1985-10-27T07:30:07.60 10.0 undecidable manual PN 25 1.6983 0.92 1.9
--.PA1.Z. 1985-10-27T07:30:02.00 10.0 undecidable manual SG 200 0.6882 0.73 0.7
--.FA1.Z. 1985-10-27T07:30:01.00 10.0 undecidable manual PN 252 1.2765 0.11 1.4
--.DR2.Z. 1985-10-27T07:29:59.40 10.0 undecidable manual PN 30 1.1211 0.69 2.3
--.RCI.Z. 1985-10-27T07:29:55.00 10.0 undecidable manual SG 38 0.5439 -2.01 0.1
--.GIB.Z. 1985-10-27T07:29:54.70 10.0 undecidable manual PG 289 0.9768 -1.6 0.4
--.GA2.Z. 1985-10-27T07:29:52.40 10.0 undecidable manual PG 44 0.6882 1.4 1.2
--.PA1.Z. 1985-10-27T07:29:49.00 10.0 undecidable manual PG 200 0.6882 -1.77 0.3
--.RCI.Z. 1985-10-27T07:29:48.20 10.0 negative manual PG 38 0.5439 -0.12 2.8
--.MSI.Z. 1985-10-27T07:29:48.00 10.0 undecidable manual PG 27 0.5883 -1.13 1.6
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