Earthquake with magnitude of Md 2.7 on date 26-09-1985 and time 04:32:20 (UTC) in region Costa Marchigiana Anconetana (Ancona)

A magnitude Md 2.7 earthquake occured in region: Costa Marchigiana Anconetana (Ancona), on

  • 26-09-1985 04:32:20 (UTC)
  • 26-09-1985 06:32:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.79, 13.4 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
Senigallia AN 17 45027 45027
Montemarciano AN 18 9992 55019
Falconara Marittima AN 18 26565 81584

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NW of Ancona (100861 inhabitants)
31 Km E of Fano (60888 inhabitants)
42 Km E of Pesaro (94582 inhabitants)
74 Km E of Rimini (147750 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 2.7 1985-09-26
04:32:20
43.79 13.41 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 13779
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-09-26 04:32:20 ± 0.294
Latitude 43.79 ± 0.02
Longitude 13.41 ± 0.03
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 13779

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) 3352.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 145
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00243
Epicentral distance of station farthest from the epicenter (degree) 0.02501
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

Md:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 13779
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:16:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ZOU.Z. 1985-09-26T04:33:05.00 10.0 undecidable manual PN 354 0.025 0.4 0.9
--.BAD.Z. 1985-09-26T04:32:59.70 10.0 undecidable manual PN 357 0.022 -0.32 1
--.DRE.Z. 1985-09-26T04:32:59.20 10.0 undecidable manual PN 4 0.0215 0.01 1.1
--.BUA.Z. 1985-09-26T04:32:59.70 10.0 undecidable manual PN 355 0.0219 -0.14 1.1
--.CM2.Z. 1985-09-26T04:32:44.00 10.0 undecidable manual SG 197 0.0056 1.66 0.2
--.CH1.Z. 1985-09-26T04:32:43.00 10.0 undecidable manual PN 261 0.0096 1.98 0.2
--.ALP.Z. 1985-09-26T04:32:40.80 10.0 undecidable manual PG 173 0.0091 0.54 1.5
--.AR1.Z. 1985-09-26T04:32:37.00 10.0 undecidable manual SG 229 0.004 0.52 0.6
--.AS1.Z. 1985-09-26T04:32:37.00 10.0 undecidable manual PG 217 0.0082 -1.29 0.7
--.PRO.N. 1985-09-26T04:32:33.80 10.0 undecidable manual SG 289 0.0036 -1.24 0.3
--.AM1.Z. 1985-09-26T04:32:32.20 10.0 undecidable manual SG 149 0.0024 1.04 0.6
--.CM2.Z. 1985-09-26T04:32:31.40 10.0 positive manual PG 197 0.0056 -1.64 0.4
--.AR1.Z. 1985-09-26T04:32:29.00 10.0 undecidable manual PG 229 0.004 -0.66 1.4
--.PRO.Z. 1985-09-26T04:32:29.40 10.0 undecidable manual PG 289 0.0036 0.57 1.5
--.AM1.Z. 1985-09-26T04:32:26.20 10.0 negative manual PG 149 0.0024 -0.39 3.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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