Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 21-08-1991 and time 15:30:08 (Italy) in region 5 km SW Moio Alcantara (ME)

A magnitude Md 2.5 earthquake occured in region: 5 km SW Moio Alcantara (ME), on

  • 21-08-1991 13:30:08 (UTC)
  • 21-08-1991 15:30:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8790, 15.0060 at 23 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
Moio Alcantara ME 5 717 717
Randazzo CT 5 10900 11617
Santa Domenica Vittoria ME 6 980 12597
Roccella Valdemone ME 6 666 13263
Malvagna ME 6 733 13996
Castiglione di Sicilia CT 10 3215 17211
Francavilla di Sicilia ME 12 3945 21156
Linguaglossa CT 13 5403 26559
Maletto CT 13 3920 30479
Floresta ME 15 485 30964
Motta Camastra ME 15 845 31809
Montalbano Elicona ME 16 2287 34096
Piedimonte Etneo CT 17 3963 38059
Maniace CT 17 3765 41824
Bronte CT 18 19172 60996
Fondachelli-Fantina ME 19 1019 62015
Gaggi ME 19 3184 65199
Novara di Sicilia ME 19 1337 66536
Sant'Alfio CT 19 1582 68118
Graniti ME 20 1492 69610
San Piero Patti ME 20 2915 72525
Milo CT 20 1087 73612

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of Acireale (52622 inhabitants)
42 Km N of Catania (314555 inhabitants)
60 Km SW of Messina (238439 inhabitants)
62 Km W of Reggio di Calabria (183035 inhabitants)
93 Km E of Caltanissetta (63360 inhabitants)
94 Km N of Siracusa (122291 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 2.5
ML-VAX 2.3 		1991-08-21
13:30:08		 37.879 15.006 23 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 147929
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-08-21 13:30:08 ± 0.146
Latitude 37.8790 ± 0.0113
Longitude 15.0060 ± 0.0147
Depth (km) 23 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 147929

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) 1797.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 88
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
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) 0.00219
Epicentral distance of station farthest from the epicenter (degree) 0.01441
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 147929
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:18:03

ML:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 147929
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
--.CZI.Z. 1991-08-21T13:30:55.00 10.0 undecidable manual SN 32 1.5984 0.8 0.1
--.PZI.Z. 1991-08-21T13:30:36.67 10.0 undecidable manual SN 183 0.8214 0.98 0.1
--.MEU.Z. 1991-08-21T13:30:35.50 10.0 undecidable manual SN 190 0.777 0.41 0.5
--.GIB.Z. 1991-08-21T13:30:35.90 10.0 undecidable manual SN 278 0.777 1.27 0
--.CZI.Z. 1991-08-21T13:30:34.38 10.0 undecidable manual PN 32 1.5984 -0.34 0.8
--.SA1.Z. 1991-08-21T13:30:32.60 10.0 undecidable manual SN 348 0.6882 -0.59 0.4
--.AU9.Z. 1991-08-21T13:30:30.85 10.0 undecidable manual SG 164 0.6438 -0.38 0.5
--.MO9.Z. 1991-08-21T13:30:29.29 10.0 undecidable manual SG 76 0.5439 0.94 0.2
--.ATN.Z. 1991-08-21T13:30:25.40 10.0 undecidable manual SG 51 0.444 0.13 0.6
--.PZI.Z. 1991-08-21T13:30:24.16 10.0 undecidable manual PN 183 0.8214 0.13 1.4
--.MEU.Z. 1991-08-21T13:30:23.10 10.0 undecidable manual PN 190 0.777 -0.32 1.3
--.GIB.Z. 1991-08-21T13:30:23.46 10.0 undecidable manual PN 278 0.777 0.05 1.5
--.AU9.Z. 1991-08-21T13:30:21.14 10.0 negative manual PG 164 0.6438 -0.32 2.6
--.SA1.Z. 1991-08-21T13:30:21.12 10.0 positive manual PN 348 0.6882 -1.15 0.4
--.MO9.Z. 1991-08-21T13:30:19.81 10.0 undecidable manual PG 76 0.5439 0.02 1.5
--.MNO.Z. 1991-08-21T13:30:18.92 10.0 undecidable manual SG 282 0.2442 -0.43 0.5
--.ATN.Z. 1991-08-21T13:30:17.84 10.0 positive manual PG 51 0.444 -0.17 2.9
--.MNO.Z. 1991-08-21T13:30:14.82 10.0 negative manual PG 282 0.2442 0.22 2.8
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