Earthquake with magnitude of Md 2.1 on date 20-10-1989 and time 06:06:10 (Italy) in region 1 km S Norcia (PG)

A magnitude Md 2.1 earthquake occured in region: 1 km S Norcia (PG), on

  • 20-10-1989 05:06:10 (UTC)
  • 20-10-1989 06:06:10 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.78, 13.09 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
Norcia PG 1 4957 4957
Cascia PG 10 3217 8174
Preci PG 12 724 8898
Castelsantangelo sul Nera MC 14 281 9179
Cerreto di Spoleto PG 15 1075 10254
Poggiodomo PG 15 117 10371
Accumoli RI 16 667 11038
Visso MC 17 1107 12145
Arquata del Tronto AP 17 1178 13323
Sellano PG 18 1079 14402
Monteleone di Spoleto PG 18 599 15001
Ussita MC 19 444 15445
Vallo di Nera PG 19 364 15809
Cittareale RI 19 482 16291

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km SE of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
90 Km E of Viterbo (67173 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
98 Km W of Pescara (121014 inhabitants)
99 Km SW of Ancona (100861 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
ML-VAX 1.7
1989-10-20
05:06:10
42.78 13.09 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 102509
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1989-10-20 05:06:10 ± 0.079
Latitude 42.78 ± 0.00
Longitude 13.09 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 102509

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) 774.3
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 8
Number of defining phases 8
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) 0.00308
Epicentral distance of station farthest from the epicenter (degree) 0.00445
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 102509
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:35:31

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 102509
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
--.MNS.Z. 1989-10-20T05:06:28.46 10.0 undecidable manual SG 217 0.0045 0.1 0.7
--.ASS.Z. 1989-10-20T05:06:26.50 10.0 undecidable manual SG 311 0.0038 0.44 0.1
--.CM8.Z. 1989-10-20T05:06:25.58 10.0 undecidable manual SG 5 0.0037 -0.06 0.8
--.ALP.Z. 1989-10-20T05:06:23.72 10.0 undecidable manual SG 90 0.0031 0.23 0.4
--.MNS.Z. 1989-10-20T05:06:20.61 10.0 undecidable manual PG 217 0.0045 -0.17 1.3
--.ASS.Z. 1989-10-20T05:06:19.50 10.0 undecidable manual PG 311 0.0038 0.05 2
--.CM8.Z. 1989-10-20T05:06:18.92 10.0 undecidable manual PG 5 0.0037 -0.29 0.7
--.ALP.Z. 1989-10-20T05:06:18.40 10.0 undecidable manual PG 90 0.0031 0.07 1.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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