Earthquake with magnitude of Md 2.1 on date 31-10-1990 and time 17:06:36 (UTC) in region 3 km W Appignano (MC)

A magnitude Md 2.1 earthquake occured in region: 3 km W Appignano (MC), on

  • 31-10-1990 17:06:36 (UTC)
  • 31-10-1990 18:06:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.36, 13.31 at 17 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
Appignano MC 3 4213 4213
Treia MC 5 9403 13616
Cingoli MC 8 10352 23968
Filottrano AN 10 9499 33467
Pollenza MC 10 6618 40085
Montecassiano MC 10 7125 47210
Montefano MC 12 3541 50751
Macerata MC 13 42473 93224
Staffolo AN 13 2253 95477
Apiro MC 15 2280 97757
San Paolo di Jesi AN 16 933 98690
Santa Maria Nuova AN 16 4179 102869
Tolentino MC 16 20069 122938
San Severino Marche MC 18 12726 135664
Urbisaglia MC 18 2628 138292
Cupramontana AN 19 4756 143048
Poggio San Vicino MC 19 246 143294
Petriolo MC 19 1998 145292
Jesi AN 20 40399 185691
Corridonia MC 20 15430 201121
Monte Roberto AN 20 3061 204182
Castelbellino AN 20 4947 209129

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km SW of Ancona (100861 inhabitants)
59 Km SE of Fano (60888 inhabitants)
66 Km NE of Foligno (57155 inhabitants)
70 Km SE of Pesaro (94582 inhabitants)
80 Km E of Perugia (166134 inhabitants)
84 Km NW of Teramo (54892 inhabitants)
99 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 2.1 1990-10-31
17:06:36
43.36 13.31 17 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 129709
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-10-31 17:06:36 ± 0.215
Latitude 43.36 ± 0.01
Longitude 13.31 ± 0.01
Depth (km) 17 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 129709

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) 1452.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
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) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00089
Epicentral distance of station farthest from the epicenter (degree) 0.00542
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 129709
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:00:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ALP.Z. 1990-10-31T17:06:58.60 10.0 undecidable manual SG 161 0.0054 0.72 0
--.ASS.Z. 1990-10-31T17:06:57.00 10.0 undecidable manual SG 238 0.005 0.43 0.1
--.ALP.Z. 1990-10-31T17:06:48.40 10.0 undecidable manual PG 161 0.0054 -0.43 0.2
--.ARV.Z. 1990-10-31T17:06:48.69 10.0 undecidable manual SG 298 0.0027 0.26 0.3
--.ASS.Z. 1990-10-31T17:06:48.00 10.0 undecidable manual PG 238 0.005 -0.07 0.9
--.AOI.Z. 1990-10-31T17:06:48.10 10.0 undecidable manual SG 47 0.0025 0.21 0.5
--.CIO.Z. 1990-10-31T17:06:45.10 10.0 undecidable manual SG 217 0.0018 -0.3 0.3
--.AOI.Z. 1990-10-31T17:06:43.00 10.0 undecidable manual PG 47 0.0025 -0.06 2.5
--.ARV.Z. 1990-10-31T17:06:43.37 10.0 undecidable manual PG 298 0.0027 0 1.3
--.SSO.Z. 1990-10-31T17:06:42.90 10.0 undecidable manual SG 128 0.0009 -0.01 0.8
--.CIO.Z. 1990-10-31T17:06:41.60 10.0 undecidable manual PG 217 0.0018 -0.03 2.6
--.SSO.Z. 1990-10-31T17:06:40.20 10.0 undecidable manual PG 128 0.0009 0.02 2.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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