Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 18-12-1990 and time 23:36:52 (Italy) in region 3 km NE Ragalna (CT)

A magnitude Md 2.4 earthquake occured in region: 3 km NE Ragalna (CT), on

  • 18-12-1990 22:36:52 (UTC)
  • 18-12-1990 23:36:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6490, 14.9630 at 10 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 3 3924 3924
Belpasso CT 6 28108 32032
Nicolosi CT 7 7463 39495
Santa Maria di Licodia CT 8 7641 47136
Biancavilla CT 8 24007 71143
Pedara CT 9 14102 85245
Paternò CT 10 48228 133473
Camporotondo Etneo CT 10 5023 138496
San Pietro Clarenza CT 10 7743 146239
Trecastagni CT 11 10910 157149
Mascalucia CT 12 31958 189107
Adrano CT 12 36122 225229
Viagrande CT 13 8563 233792
Tremestieri Etneo CT 13 20589 254381
Gravina di Catania CT 13 25838 280219
Zafferana Etnea CT 14 9517 289736
Aci Bonaccorsi CT 14 3524 293260
San Giovanni la Punta CT 14 23060 316320
Sant'Agata li Battiati CT 14 9479 325799
Misterbianco CT 15 49410 375209
Motta Sant'Anastasia CT 15 12116 387325
Aci Sant'Antonio CT 15 17984 405309
San Gregorio di Catania CT 16 11966 417275
Milo CT 16 1087 418362
Santa Venerina CT 16 8592 426954
Valverde CT 16 7840 434794
Aci Catena CT 17 29851 464645
Acireale CT 18 52622 517267
Aci Castello CT 19 18723 535990
Sant'Alfio CT 19 1582 537572
Bronte CT 19 19172 556744
Catania CT 20 314555 871299
Centuripe EN 20 5470 876769

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km W of Acireale (52622 inhabitants)
20 Km NW of Catania (314555 inhabitants)
72 Km NW of Siracusa (122291 inhabitants)
79 Km SW of Reggio di Calabria (183035 inhabitants)
80 Km SW of Messina (238439 inhabitants)
81 Km E of Caltanissetta (63360 inhabitants)
83 Km N of Ragusa (73313 inhabitants)
86 Km NE of Vittoria (63339 inhabitants)
90 Km N of Modica (54633 inhabitants)
90 Km NE of Gela (75827 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		Md 2.4
ML-VAX 1.7 		1990-12-18
22:36:52		 37.649 14.963 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 132739
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-12-18 22:36:52 ± 0.297
Latitude 37.6490 ± 0.0177
Longitude 14.9630 ± 0.0358
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 132739

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) 3718.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00316
Epicentral distance of station farthest from the epicenter (degree) 0.00858
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 132739
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:03:40

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 132739
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.SOI.Z. 1990-12-18T22:37:26.50 10.0 undecidable manual SG 63 0.9546 1.4 0.1
--.ATN.Z. 1990-12-18T22:37:13.66 10.0 undecidable manual SG 37 0.6327 -1.29 0.1
--.MEU.Z. 1990-12-18T22:37:12.86 10.0 undecidable manual SG 190 0.5439 1.01 0.2
--.SOI.Z. 1990-12-18T22:37:12.00 10.0 undecidable manual PG 63 0.9546 0.73 0.7
--.PZI.Z. 1990-12-18T22:37:11.87 10.0 undecidable manual SG 181 0.5883 -1.44 0.1
--.MNO.Z. 1990-12-18T22:37:06.67 10.0 undecidable manual SG 323 0.3552 1.02 0.2
--.ATN.Z. 1990-12-18T22:37:04.89 10.0 positive manual PG 37 0.6327 -0.51 2.4
--.PZI.Z. 1990-12-18T22:37:04.48 10.0 undecidable manual PG 181 0.5883 0.02 1.6
--.MEU.Z. 1990-12-18T22:37:03.57 10.0 undecidable manual PG 190 0.5439 -0.04 1.6
--.MNO.Z. 1990-12-18T22:36:59.93 10.0 negative manual PG 323 0.3552 -0.1 3.1
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download