INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of Md 2.4 on date 31-03-1985 and time 09:37:03 (UTC) in region 2 km S Terni (TR)

A magnitude Md 2.4 earthquake occured in region: 2 km S Terni (TR), on

  • 31-03-1985 09:37:03 (UTC)
  • 31-03-1985 11:37:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.54, 12.64 at 0 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
Terni TR 2 111501 111501
Stroncone TR 5 4917 116418
Narni TR 10 19785 136203
San Gemini TR 11 5018 141221
Arrone TR 12 2763 143984
Montefranco TR 12 1276 145260
Colli sul Velino RI 12 533 145793
Configni RI 13 633 146426
Labro RI 13 374 146800
Greccio RI 14 1558 148358
Ferentillo TR 15 1913 150271
Cottanello RI 15 563 150834
Morro Reatino RI 16 373 151207
Calvi dell'Umbria TR 17 1856 153063
Vacone RI 17 256 153319
Montecastrilli TR 17 5022 158341
Montasola RI 18 395 158736
Polino TR 18 233 158969
Contigliano RI 18 3783 162752
Rivodutri RI 18 1253 164005
Acquasparta TR 18 4778 168783
Otricoli TR 19 1869 170652
Amelia TR 19 11897 182549
Montebuono RI 20 883 183432

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km S of Terni (111501 inhabitants)
46 Km E of Viterbo (67173 inhabitants)
47 Km S of Foligno (57155 inhabitants)
61 Km N of Guidonia Montecelio (88673 inhabitants)
65 Km N of Tivoli (56533 inhabitants)
66 Km W of L'Aquila (69753 inhabitants)
66 Km SE of Perugia (166134 inhabitants)
73 Km N of Roma (2864731 inhabitants)
86 Km NE of Civitavecchia (52991 inhabitants)
88 Km W of Teramo (54892 inhabitants)
92 Km NE of Fiumicino (78395 inhabitants)
96 Km N of Velletri (53303 inhabitants)
97 Km N of Pomezia (62966 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 2.4 1985-03-31
09:37:03
42.54 12.64 0 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 3819
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-03-31 09:37:03 ± 0.157
Latitude 42.54 ± 0.01
Longitude 12.64 ± 0.02
Depth (km) 0 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 3819

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) 1666.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 166
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
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) 0.00138
Epicentral distance of station farthest from the epicenter (degree) 0.01077
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 3819
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-03-31T09:37:39.00 10.0 undecidable manual SG 12 0.0088 0.34 0.2
--.CH1.Z. 1985-03-31T09:37:27.50 10.0 undecidable manual PN 335 0.0108 0.11 0.8
--.AS1.Z. 1985-03-31T09:37:23.50 10.0 undecidable manual SG 0 0.0046 0.11 0.6
--.AR1.Z. 1985-03-31T09:37:23.00 10.0 undecidable manual PG 12 0.0088 -0.73 0.2
--.AS1.Z. 1985-03-31T09:37:15.00 10.0 undecidable manual PG 0 0.0046 0.09 1.6
--.PO9.Z. 1985-03-31T09:37:12.50 10.0 undecidable manual SG 81 0.0019 0.53 0.2
--.MNS.Z. 1985-03-31T09:37:09.50 10.0 undecidable manual SG 169 0.0014 0.03 1
--.PO9.Z. 1985-03-31T09:37:08.00 10.0 undecidable manual PG 81 0.0019 -0.32 1
--.MNS.Z. 1985-03-31T09:37:06.90 10.0 negative manual PG 169 0.0014 0.02 3.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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