Earthquake with magnitude of Md 2.2 on date 11-07-1991 and time 14:56:22 (UTC) in region 10 km SE Assoro (EN)

A magnitude Md 2.2 earthquake occured in region: 10 km SE Assoro (EN), on

  • 11-07-1991 14:56:22 (UTC)
  • 11-07-1991 16:56:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.5610, 14.4940 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Assoro EN 10 5191 5191
Raddusa CT 10 3178 8369
Agira EN 11 8345 16714
Nissoria EN 11 3000 19714
Valguarnera Caropepe EN 12 7866 27580
Leonforte EN 13 13439 41019
Castel di Iudica CT 16 4625 45644
Aidone EN 17 4889 50533
Regalbuto EN 17 7277 57810
Gagliano Castelferrato EN 17 3593 61403
Catenanuova EN 18 4866 66269
Enna EN 19 28019 94288
Calascibetta EN 20 4528 98816

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km E of Caltanissetta (63360 inhabitants)
53 Km W of Catania (314555 inhabitants)
59 Km NE of Gela (75827 inhabitants)
60 Km W of Acireale (52622 inhabitants)
68 Km N of Vittoria (63339 inhabitants)
74 Km N of Ragusa (73313 inhabitants)
82 Km N of Modica (54633 inhabitants)
85 Km E of Agrigento (59770 inhabitants)
90 Km NW 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 2.2
ML-VAX 2.0
1991-07-11
14:56:22
37.561 14.494 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 145139
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-07-11 14:56:22 ± 0.2
Latitude 37.5610 ± 0.0118
Longitude 14.4940 ± 0.0219
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 145139

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) 2337.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00356
Epicentral distance of station farthest from the epicenter (degree) 0.00583
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:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 145139
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:15:30

ML:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 145139
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
--.PZI.Z. 1991-07-11T14:56:44.80 10.0 undecidable manual SG 144 0.6105 -0.07 0.6
--.AU9.Z. 1991-07-11T14:56:44.95 10.0 undecidable manual SG 117 0.6438 -0.28 0.5
--.GIB.Z. 1991-07-11T14:56:43.56 10.0 undecidable manual SG 319 0.555 1.15 0
--.MEU.Z. 1991-07-11T14:56:42.00 10.0 undecidable manual SG 149 0.5217 0.98 0
--.MNO.Z. 1991-07-11T14:56:37.17 10.0 undecidable manual SG 23 0.3996 -0.07 0.7
--.AU9.Z. 1991-07-11T14:56:35.36 10.0 undecidable manual PG 117 0.6438 -0.2 1.4
--.PZI.Z. 1991-07-11T14:56:34.97 10.0 undecidable manual PG 144 0.6105 0.04 1.6
--.MEU.Z. 1991-07-11T14:56:33.00 10.0 undecidable manual PG 149 0.5217 -0.13 1.6
--.GIB.Z. 1991-07-11T14:56:33.56 10.0 negative manual PG 319 0.555 -0.37 2.3
--.MNO.Z. 1991-07-11T14:56:31.25 10.0 undecidable manual PG 23 0.3996 0.31 1.3
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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