Earthquake with magnitude of Md 2.1 on date 31-01-1998 and time 03:33:53 (Italy) in region 5 km W Norcia (PG)

A magnitude Md 2.1 earthquake occured in region: 5 km W Norcia (PG), on

  • 31-01-1998 02:33:53 (UTC)
  • 31-01-1998 03:33:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.81, 13.04 at 11 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 5 4957 4957
Preci PG 8 724 5681
Cerreto di Spoleto PG 10 1075 6756
Cascia PG 10 3217 9973
Sellano PG 13 1079 11052
Castelsantangelo sul Nera MC 13 281 11333
Poggiodomo PG 14 117 11450
Visso MC 14 1107 12557
Vallo di Nera PG 15 364 12921
Ussita MC 17 444 13365
Sant'Anatolia di Narco PG 19 564 13929
Monteleone di Spoleto PG 19 599 14528
Scheggino PG 20 461 14989

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
57 Km W of Teramo (54892 inhabitants)
59 Km NW of L'Aquila (69753 inhabitants)
62 Km SE of Perugia (166134 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
93 Km N of Guidonia Montecelio (88673 inhabitants)
96 Km N of Tivoli (56533 inhabitants)
97 Km W of Montesilvano (53738 inhabitants)
98 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 1998-01-31
02:33:53
42.81 13.04 11 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 321809
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1998-01-31 02:33:53 ± 0.305
Latitude 42.81 ± 0.01
Longitude 13.04 ± 0.04
Depth (km) 11 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 321809

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) 3300
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 146
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00049
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
Magnitude information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 321809
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 22:01:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1998-01-31T02:34:11.54 10.0 undecidable manual SG 212 0.0045 0.21 0.4
--.SNTG.Z. 1998-01-31T02:34:09.84 10.0 undecidable manual SG 350 0.004 0.05 0.6
--.ASS.Z. 1998-01-31T02:34:07.00 10.0 undecidable manual SG 311 0.0034 -0.49 0.1
--.MNS.Z. 1998-01-31T02:34:03.55 10.0 undecidable manual PG 212 0.0045 -0.2 1.1
--.ASS.Z. 1998-01-31T02:34:02.00 10.0 undecidable manual PG 311 0.0034 0.47 0.3
--.SNTG.Z. 1998-01-31T02:34:02.70 10.0 undecidable manual PG 350 0.004 -0.16 1.3
--.NRCA.Z. 1998-01-31T02:33:58.00 10.0 undecidable manual SG 65 0.0005 0.25 0.5
--.NRCA.Z. 1998-01-31T02:33:55.83 10.0 positive manual PG 65 0.0005 -0.08 3.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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