Earthquake with magnitude of Md 2.6 on date 21-04-1985 and time 15:53:12 (UTC) in region 3 km SE Castel Focognano (AR)

A magnitude Md 2.6 earthquake occured in region: 3 km SE Castel Focognano (AR), on

  • 21-04-1985 15:53:12 (UTC)
  • 21-04-1985 17:53:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.64, 11.87 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
Castel Focognano AR 3 3149 3149
Chitignano AR 3 899 4048
Subbiano AR 7 6331 10379
Talla AR 7 1062 11441
Bibbiena AR 7 12241 23682
Capolona AR 8 5438 29120
Chiusi della Verna AR 9 2023 31143
Caprese Michelangelo AR 10 1426 32569
Ortignano Raggiolo AR 10 878 33447
Poppi AR 13 6160 39607
Pieve Santo Stefano AR 15 3183 42790
Castiglion Fibocchi AR 15 2167 44957
Castel San Niccolò AR 17 2707 47664
Anghiari AR 19 5638 53302
Arezzo AR 19 99543 152845
Laterina AR 19 3517 156362
Loro Ciuffenna AR 19 5819 162181

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km N of Arezzo (99543 inhabitants)
51 Km E of Firenze (382808 inhabitants)
56 Km NE of Siena (53903 inhabitants)
57 Km E of Scandicci (50609 inhabitants)
63 Km SW of Cesena (96758 inhabitants)
67 Km S of Forlì (117913 inhabitants)
67 Km E of Prato (191150 inhabitants)
72 Km S of Faenza (58541 inhabitants)
73 Km NW of Perugia (166134 inhabitants)
73 Km SW of Rimini (147750 inhabitants)
81 Km S of Imola (69797 inhabitants)
83 Km E of Pistoia (90315 inhabitants)
90 Km W of Pesaro (94582 inhabitants)
91 Km SW of Ravenna (159116 inhabitants)
96 Km W of Fano (60888 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
Rev 1000 Md 2.6 1985-04-21
15:53:12
43.64 11.87 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 5189
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-21 15:53:12 ± 0.39
Latitude 43.64 ± 0.05
Longitude 11.87 ± 0.05
Depth (km) 10 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 5189

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) 6446.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
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) 1
Epicentral distance of station closest to the epicenter (degree) 0.00049
Epicentral distance of station farthest from the epicenter (degree) 0.02169
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 5189
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CTI.Z. 1985-04-21T15:54:20.50 10.0 undecidable manual SN 356 0.0217 -0.14 0.5
--.CTI.Z. 1985-04-21T15:53:53.00 10.0 undecidable manual PN 356 0.0217 1.05 0.8
--.BD1.Z. 1985-04-21T15:53:46.50 10.0 undecidable manual SG 295 0.0091 -0.57 0.7
--.PS9.Z. 1985-04-21T15:53:44.00 10.0 undecidable manual SG 275 0.0087 -1.95 0.2
--.AS1.Z. 1985-04-21T15:53:42.00 10.0 undecidable manual SG 134 0.0073 1.29 0.4
--.AR1.Z. 1985-04-21T15:53:38.00 10.0 undecidable manual SG 99 0.007 -2.07 0.2
--.PO9.Z. 1985-04-21T15:53:38.00 10.0 undecidable manual PN 143 0.0118 1.05 1.2
--.BD1.Z. 1985-04-21T15:53:34.00 10.0 undecidable manual PG 295 0.0091 1.43 1
--.PS9.Z. 1985-04-21T15:53:30.50 10.0 undecidable manual PG 275 0.0087 -1.43 1
--.AS1.Z. 1985-04-21T15:53:29.00 10.0 undecidable manual PG 134 0.0073 0.1 1.9
--.AR1.Z. 1985-04-21T15:53:26.50 10.0 undecidable manual PG 99 0.007 -2.04 0.5
--.CH1.Z. 1985-04-21T15:53:15.50 10.0 positive manual PG 99 0.0005 0.33 3.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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