Earthquake with magnitude of Md 1.9 on date 21-06-1985 and time 05:21:50 (UTC) in region 1 km W Montefano (MC)

A magnitude Md 1.9 earthquake occured in region: 1 km W Montefano (MC), on

  • 21-06-1985 05:21:50 (UTC)
  • 21-06-1985 07:21:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.41, 13.43 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
Montefano MC 1 3541 3541
Montecassiano MC 5 7125 10666
Filottrano AN 7 9499 20165
Appignano MC 8 4213 24378
Osimo AN 9 34977 59355
Recanati MC 10 21349 80704
Castelfidardo AN 11 18733 99437
Macerata MC 13 42473 141910
Polverigi AN 13 4508 146418
Offagna AN 13 1935 148353
Santa Maria Nuova AN 13 4179 152532
Montelupone MC 14 3596 156128
Treia MC 15 9403 165531
Loreto AN 15 12814 178345
Agugliano AN 15 4865 183210
Morrovalle MC 17 10195 193405
Potenza Picena MC 17 15936 209341
Camerano AN 17 7322 216663
Pollenza MC 17 6618 223281
Cingoli MC 17 10352 233633
Jesi AN 19 40399 274032
Camerata Picena AN 19 2567 276599
Porto Recanati MC 19 12531 289130
Numana AN 19 3775 292905
Corridonia MC 19 15430 308335
Staffolo AN 20 2253 310588
Sirolo AN 20 4051 314639
Montecosaro MC 20 7113 321752

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SW of Ancona (100861 inhabitants)
58 Km SE of Fano (60888 inhabitants)
69 Km SE of Pesaro (94582 inhabitants)
78 Km NE of Foligno (57155 inhabitants)
87 Km N of Teramo (54892 inhabitants)
91 Km E of Perugia (166134 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 1.9 1985-06-21
05:21:50
43.41 13.43 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 8829
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-06-21 05:21:50 ± 0.426
Latitude 43.41 ± 0.04
Longitude 13.43 ± 0.07
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 8829

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) 7589
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
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) 0.00162
Epicentral distance of station farthest from the epicenter (degree) 0.00575
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 8829
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:12:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ALP.Z. 1985-06-21T05:22:14.50 10.0 undecidable manual SG 170 0.0057 2.01 0
--.ALP.Z. 1985-06-21T05:22:03.40 10.0 undecidable manual PG 170 0.0057 0.41 0.9
--.CM2.Z. 1985-06-21T05:22:01.00 10.0 undecidable manual SG 223 0.0027 -0.63 0.7
--.AR1.Z. 1985-06-21T05:21:59.50 10.0 undecidable manual PG 283 0.0032 1.68 0.3
--.AM1.Z. 1985-06-21T05:21:58.10 10.0 undecidable manual SG 42 0.0016 0.17 0.8
--.CM2.Z. 1985-06-21T05:21:55.80 10.0 negative manual PG 223 0.0027 -0.92 1.7
--.AM1.Z. 1985-06-21T05:21:54.20 10.0 negative manual PG 42 0.0016 -0.38 2.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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