Earthquake with magnitude of Md 2.6 on date 21-03-1985 and time 07:40:24 (Italy) in region 5 km N Chiusi della Verna (AR)

A magnitude Md 2.6 earthquake occured in region: 5 km N Chiusi della Verna (AR), on

  • 21-03-1985 06:40:24 (UTC)
  • 21-03-1985 07:40:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.74, 11.95 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Chiusi della Verna AR 5 2023 2023
Verghereto FC 7 1907 3930
Chitignano AR 11 899 4829
Pieve Santo Stefano AR 11 3183 8012
Caprese Michelangelo AR 11 1426 9438
Bibbiena AR 12 12241 21679
Bagno di Romagna FC 13 6026 27705
Castel Focognano AR 14 3149 30854
Poppi AR 15 6160 37014
Casteldelci RN 17 407 37421
Ortignano Raggiolo AR 17 878 38299
Badia Tedalda AR 19 1087 39386
Pratovecchio Stia AR 19 5845 45231
Subbiano AR 20 6331 51562
Castel San Niccolò AR 20 2707 54269

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km N of Arezzo (99543 inhabitants)
50 Km SW of Cesena (96758 inhabitants)
54 Km S of Forlì (117913 inhabitants)
56 Km E of Firenze (382808 inhabitants)
61 Km SW of Rimini (147750 inhabitants)
61 Km S of Faenza (58541 inhabitants)
62 Km E of Scandicci (50609 inhabitants)
69 Km NE of Siena (53903 inhabitants)
70 Km E of Prato (191150 inhabitants)
71 Km S of Imola (69797 inhabitants)
78 Km S of Ravenna (159116 inhabitants)
79 Km NW of Perugia (166134 inhabitants)
79 Km W of Pesaro (94582 inhabitants)
86 Km E of Pistoia (90315 inhabitants)
86 Km W of Fano (60888 inhabitants)
97 Km SE of Bologna (386663 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 1985-03-21
06:40:24
43.74 11.95 8 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 3439
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-21 06:40:24 ± 0.611
Latitude 43.74 ± 0.04
Longitude 11.95 ± 0.03
Depth (km) 8 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3439

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) 5141.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
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) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00097
Epicentral distance of station farthest from the epicenter (degree) 0.02615
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 3439
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FO1.Z. 1985-03-21T06:41:12.00 10.0 undecidable manual PN? 11 0.0261 0.95 0.2
--.CTI.Z. 1985-03-21T06:41:04.50 10.0 undecidable manual PN? 354 0.0208 1.62 0.1
--.PS9.Z. 1985-03-21T06:41:00.00 10.0 undecidable manual SG 269 0.0092 -0.19 0.8
--.AS1.Z. 1985-03-21T06:40:55.00 10.0 undecidable manual SG 143 0.0076 0.7 0.5
--.PO9.Z. 1985-03-21T06:40:50.60 10.0 undecidable manual PN? 147 0.0123 0.62 0.5
--.AR1.Z. 1985-03-21T06:40:50.50 10.0 undecidable manual SG 108 0.0068 -0.82 0.6
--.BD1.Z. 1985-03-21T06:40:45.50 10.0 undecidable manual PG 288 0.0092 0.35 1.9
--.PS9.Z. 1985-03-21T06:40:44.00 10.0 undecidable manual PG 269 0.0092 -1.25 0.8
--.AS1.Z. 1985-03-21T06:40:42.50 10.0 undecidable manual PG 143 0.0076 0.65 1.4
--.AR1.Z. 1985-03-21T06:40:38.50 10.0 undecidable manual PG 108 0.0068 -1.63 0.4
--.CH1.Z. 1985-03-21T06:40:30.00 10.0 undecidable manual SG 181 0.001 -0.18 0.8
--.CH1.Z. 1985-03-21T06:40:28.00 10.0 positive manual PG 181 0.001 0.08 4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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