Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 26-01-1991 and time 11:55:00 (UTC) in region 10 km NE Ragalna (CT)

A magnitude Md 2.3 earthquake occured in region: 10 km NE Ragalna (CT), on

  • 26-01-1991 11:55:00 (UTC)
  • 26-01-1991 12:55:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7130, 14.9780 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 10 3924 3924
Zafferana Etnea CT 11 9517 13441
Nicolosi CT 12 7463 20904
Biancavilla CT 12 24007 44911
Milo CT 12 1087 45998
Pedara CT 13 14102 60100
Santa Maria di Licodia CT 13 7641 67741
Belpasso CT 13 28108 95849
Trecastagni CT 14 10910 106759
Adrano CT 14 36122 142881
Santa Venerina CT 15 8592 151473
Sant'Alfio CT 15 1582 153055
Bronte CT 15 19172 172227
Viagrande CT 15 8563 180790
San Pietro Clarenza CT 16 7743 188533
Camporotondo Etneo CT 16 5023 193556
Maletto CT 16 3920 197476
Paternò CT 16 48228 245704
Mascalucia CT 17 31958 277662
Aci Bonaccorsi CT 17 3524 281186
Tremestieri Etneo CT 17 20589 301775
Aci Sant'Antonio CT 18 17984 319759
San Giovanni la Punta CT 18 23060 342819
Giarre CT 18 27659 370478
Gravina di Catania CT 18 25838 396316
Randazzo CT 19 10900 407216
Aci Catena CT 19 29851 437067
Sant'Agata li Battiati CT 19 9479 446546
Valverde CT 20 7840 454386
Mascali CT 20 14282 468668
Acireale CT 20 52622 521290
San Gregorio di Catania CT 20 11966 533256

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NW of Acireale (52622 inhabitants)
25 Km NW of Catania (314555 inhabitants)
73 Km SW of Reggio di Calabria (183035 inhabitants)
74 Km SW of Messina (238439 inhabitants)
78 Km NW of Siracusa (122291 inhabitants)
84 Km E of Caltanissetta (63360 inhabitants)
90 Km N of Ragusa (73313 inhabitants)
93 Km NE of Vittoria (63339 inhabitants)
96 Km NE of Gela (75827 inhabitants)
97 Km N of Modica (54633 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 2.3
ML-VAX 1.8 		1991-01-26
11:55:00		 37.713 14.978 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 134979
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-01-26 11:55:00 ± 0.237
Latitude 37.7130 ± 0.0108
Longitude 14.9780 ± 0.0277
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 134979

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) 2712.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00275
Epicentral distance of station farthest from the epicenter (degree) 0.00826
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 134979
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:05:50

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 134979
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. 1991-01-26T11:55:32.90 10.0 undecidable manual SG 66 0.9213 0.93 0
--.PZI.Z. 1991-01-26T11:55:23.52 10.0 undecidable manual SG 182 0.6549 0.06 0.6
--.MEU.Z. 1991-01-26T11:55:22.43 10.0 undecidable manual SG 190 0.6105 0.41 0.3
--.SOI.Z. 1991-01-26T11:55:18.90 10.0 undecidable manual PG 66 0.9213 -0.56 0.4
--.PZI.Z. 1991-01-26T11:55:13.69 10.0 negative manual PG 182 0.6549 -0.04 3.2
--.MEU.Z. 1991-01-26T11:55:12.75 10.0 undecidable manual PG 190 0.6105 -0.15 1.5
--.MNO.Z. 1991-01-26T11:55:12.31 10.0 undecidable manual SG 314 0.3108 -0.13 0.6
--.MNO.Z. 1991-01-26T11:55:07.57 10.0 undecidable manual PG 314 0.3108 0.2 1.4
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