Earthquake with magnitude of Md 2.8 on date 22-04-1991 and time 23:59:28 (UTC) in region 6 km W Filottrano (AN)

A magnitude Md 2.8 earthquake occured in region: 6 km W Filottrano (AN), on

  • 22-04-1991 23:59:28 (UTC)
  • 23-04-1991 01:59:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.41, 13.28 at 5 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
Filottrano AN 6 9499 9499
Cingoli MC 7 10352 19851
Appignano MC 7 4213 24064
Staffolo AN 8 2253 26317
Santa Maria Nuova AN 10 4179 30496
San Paolo di Jesi AN 10 933 31429
Treia MC 11 9403 40832
Apiro MC 12 2280 43112
Montefano MC 13 3541 46653
Jesi AN 13 40399 87052
Montecassiano MC 13 7125 94177
Castelbellino AN 14 4947 99124
Cupramontana AN 14 4756 103880
Monte Roberto AN 14 3061 106941
Maiolati Spontini AN 15 6248 113189
Polverigi AN 16 4508 117697
Pollenza MC 17 6618 124315
Poggio San Vicino MC 17 246 124561
Agugliano AN 17 4865 129426
Monsano AN 17 3405 132831
Osimo AN 18 34977 167808
Macerata MC 18 42473 210281
Offagna AN 18 1935 212216
Castelplanio AN 19 3540 215756
Rosora AN 19 1985 217741
San Marcello AN 20 2057 219798
Camerata Picena AN 20 2567 222365

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Ancona (100861 inhabitants)
53 Km SE of Fano (60888 inhabitants)
63 Km SE of Pesaro (94582 inhabitants)
69 Km NE of Foligno (57155 inhabitants)
80 Km E of Perugia (166134 inhabitants)
90 Km NW of Teramo (54892 inhabitants)
93 Km SE 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 2.8
ML-VAX 2.0
1991-04-22
23:59:28
43.41 13.28 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 139829
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-04-22 23:59:28 ± 0.677
Latitude 43.41 ± 0.04
Longitude 13.28 ± 0.06
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 139829

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) 6542.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 224
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) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00235
Epicentral distance of station farthest from the epicenter (degree) 0.01093
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 139829
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:10:31

ML:2

Field Value
Value 2
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 139829
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 Takeoff_angle Residual Weight
--.AQU.Z. 1991-04-23T00:00:04.85 10.0 undecidable manual SG 175 0.0095 -0.16 0.6
--.CRE.Z. 1991-04-23T00:00:03.76 10.0 undecidable manual SG 282 0.0088 1.02 0.1
--.RSM.Z. 1991-04-22T23:59:54.88 10.0 undecidable manual SG 310 0.0071 -1.63 0
--.PGD.Z. 1991-04-22T23:59:53.56 10.0 undecidable manual PN 292 0.0109 1.8 0
--.SFI.Z. 1991-04-22T23:59:50.83 10.0 undecidable manual PN 295 0.0103 0.06 1.4
--.AQU.Z. 1991-04-22T23:59:49.33 10.0 undecidable manual PG 175 0.0095 -0.1 1.4
--.CRE.Z. 1991-04-22T23:59:47.56 10.0 undecidable manual PG 282 0.0088 -0.55 0.9
--.RSM.Z. 1991-04-22T23:59:45.14 10.0 undecidable manual PG 310 0.0071 0.62 0.9
--.ARV.Z. 1991-04-22T23:59:37.93 10.0 undecidable manual SG 289 0.0023 -0.45 0.5
--.ARV.Z. 1991-04-22T23:59:34.30 10.0 positive manual PG 289 0.0023 0.24 3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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