Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 18-07-1991 and time 02:28:22 (UTC) in region 5 km NW Zocca (MO)

A magnitude Md 2.4 earthquake occured in region: 5 km NW Zocca (MO), on

  • 18-07-1991 02:28:22 (UTC)
  • 18-07-1991 04:28:22 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3810, 10.9520 at 8 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
Zocca MO 5 4719 4719
Guiglia MO 5 3931 8650
Marano sul Panaro MO 9 5060 13710
Pavullo nel Frignano MO 10 17383 31093
Castel d'Aiano BO 12 1906 32999
Vignola MO 12 25353 58352
Montese MO 13 3353 61705
Savignano sul Panaro MO 13 9177 70882
Serramazzoni MO 14 8282 79164
Castelvetro di Modena MO 14 11185 90349
Vergato BO 17 7639 97988
Maranello MO 17 17359 115347
Valsamoggia BO 17 30561 145908
Spilamberto MO 18 12621 158529
Polinago MO 19 1672 160201
Castelnuovo Rangone MO 19 14896 175097
Lama Mocogno MO 19 2734 177831

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km S of Modena (184973 inhabitants)
34 Km W of Bologna (386663 inhabitants)
44 Km SE of Reggio nell'Emilia (171345 inhabitants)
45 Km S of Carpi (70699 inhabitants)
50 Km N of Pistoia (90315 inhabitants)
57 Km N of Prato (191150 inhabitants)
61 Km W of Imola (69797 inhabitants)
68 Km SE of Parma (192836 inhabitants)
70 Km NE of Lucca (89046 inhabitants)
72 Km N of Scandicci (50609 inhabitants)
72 Km NW of Firenze (382808 inhabitants)
73 Km SW of Ferrara (133155 inhabitants)
75 Km NE of Massa (69479 inhabitants)
75 Km W of Faenza (58541 inhabitants)
76 Km E of Carrara (63133 inhabitants)
80 Km NE of Viareggio (62467 inhabitants)
86 Km NE of Pisa (89158 inhabitants)
89 Km W of Forlì (117913 inhabitants)
94 Km E of La Spezia (93959 inhabitants)
99 Km W of Ravenna (159116 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 2.4 		1991-07-18
02:28:22		 44.381 10.952 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 145719
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-07-18 02:28:22 ± 0.53
Latitude 44.3810 ± 0.0332
Longitude 10.9520 ± 0.0185
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 145719

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) 3976.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 262
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) 0.00227
Epicentral distance of station farthest from the epicenter (degree) 0.00939
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 5
Type of magnitude Md
Reference to an origin 145719
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:16:02

ML:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 145719
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
--.CRE.Z. 1991-07-18T02:28:58.35 10.0 undecidable manual SG 136 1.0434 -0.21 0.7
--.SFI.Z. 1991-07-18T02:28:51.00 10.0 undecidable manual SG 126 0.7881 0.34 0.7
--.PII.Z. 1991-07-18T02:28:48.40 10.0 undecidable manual SG 204 0.7215 0.07 0.9
--.CRE.Z. 1991-07-18T02:28:43.93 10.0 undecidable manual PG 136 1.0434 0.51 1.1
--.SFI.Z. 1991-07-18T02:28:38.46 10.0 undecidable manual PG 126 0.7881 -0.39 1.6
--.BDI.Z. 1991-07-18T02:28:38.88 10.0 undecidable manual SG 218 0.3996 0.82 0.2
--.PII.Z. 1991-07-18T02:28:37.50 10.0 undecidable manual PG 204 0.7215 -0.46 1.5
--.MME.Z. 1991-07-18T02:28:32.50 10.0 undecidable manual SG 223 0.2553 -0.62 0.4
--.BDI.Z. 1991-07-18T02:28:31.17 10.0 undecidable manual PG 218 0.3996 -0.41 1.7
--.MME.Z. 1991-07-18T02:28:29.32 10.0 undecidable manual PG 223 0.2553 0.59 1.2
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