Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 26-01-1991 and time 11:04:44 (UTC) in region 7 km NE Ragalna (CT)

A magnitude Md 2.4 earthquake occured in region: 7 km NE Ragalna (CT), on

  • 26-01-1991 11:04:44 (UTC)
  • 26-01-1991 12:04:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.6730, 14.9980 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
Nicolosi CT 7 7463 7463
Ragalna CT 7 3924 11387
Pedara CT 8 14102 25489
Belpasso CT 9 28108 53597
Trecastagni CT 9 10910 64507
Zafferana Etnea CT 10 9517 74024
Viagrande CT 11 8563 82587
San Pietro Clarenza CT 11 7743 90330
Santa Maria di Licodia CT 12 7641 97971
Camporotondo Etneo CT 12 5023 102994
Biancavilla CT 12 24007 127001
Milo CT 12 1087 128088
Mascalucia CT 12 31958 160046
Tremestieri Etneo CT 13 20589 180635
Santa Venerina CT 13 8592 189227
Aci Bonaccorsi CT 13 3524 192751
Aci Sant'Antonio CT 14 17984 210735
Paternò CT 14 48228 258963
San Giovanni la Punta CT 14 23060 282023
Gravina di Catania CT 14 25838 307861
Adrano CT 15 36122 343983
Sant'Agata li Battiati CT 15 9479 353462
Aci Catena CT 15 29851 383313
Sant'Alfio CT 15 1582 384895
Valverde CT 15 7840 392735
San Gregorio di Catania CT 15 11966 404701
Acireale CT 16 52622 457323
Misterbianco CT 17 49410 506733
Giarre CT 18 27659 534392
Motta Sant'Anastasia CT 18 12116 546508
Aci Castello CT 18 18723 565231
Bronte CT 19 19172 584403
Riposto CT 19 14838 599241
Mascali CT 20 14282 613523

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km W of Acireale (52622 inhabitants)
20 Km NW of Catania (314555 inhabitants)
73 Km NW of Siracusa (122291 inhabitants)
75 Km SW of Reggio di Calabria (183035 inhabitants)
76 Km SW of Messina (238439 inhabitants)
85 Km E of Caltanissetta (63360 inhabitants)
86 Km N of Ragusa (73313 inhabitants)
90 Km NE of Vittoria (63339 inhabitants)
93 Km N of Modica (54633 inhabitants)
94 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 2.1 		1991-01-26
11:04:44		 37.673 14.998 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 134959
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-01-26 11:04:44 ± 0.116
Latitude 37.6730 ± 0.0067
Longitude 14.9980 ± 0.0111
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 134959

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) 1229.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00316
Epicentral distance of station farthest from the epicenter (degree) 0.00826
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 134959
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:05:49

ML:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 134959
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. 1991-01-26T11:05:16.73 10.0 undecidable manual SG 63 0.9213 0.59 0.2
--.GIB.Z. 1991-01-26T11:05:12.80 10.0 undecidable manual SG 292 0.8214 -0.27 0.6
--.ATN.Z. 1991-01-26T11:05:06.23 10.0 undecidable manual SG 36 0.5994 0.25 0.7
--.PZI.Z. 1991-01-26T11:05:06.20 10.0 undecidable manual SG 183 0.6105 -0.27 0.6
--.MEU.Z. 1991-01-26T11:05:05.68 10.0 undecidable manual SG 193 0.5772 0.72 0.1
--.SOI.Z. 1991-01-26T11:05:02.45 10.0 undecidable manual PG 63 0.9213 -0.34 1.1
--.GIB.Z. 1991-01-26T11:05:01.53 10.0 undecidable manual PG 292 0.8214 0.52 0.6
--.MNO.Z. 1991-01-26T11:04:57.20 10.0 undecidable manual SG 317 0.3552 -0.6 0.2
--.PZI.Z. 1991-01-26T11:04:57.50 10.0 undecidable manual PG 183 0.6105 -0.04 2.1
--.MEU.Z. 1991-01-26T11:04:56.40 10.0 undecidable manual PG 193 0.5772 -0.29 1.5
--.ATN.Z. 1991-01-26T11:04:56.82 10.0 undecidable manual PG 36 0.5994 -0.09 2.1
--.MNO.Z. 1991-01-26T11:04:52.27 10.0 undecidable manual PG 317 0.3552 0.07 2.1
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