Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.5 on date 18-10-1988 and time 01:05:16 (UTC) in region 6 km E Foligno (PG)

A magnitude Md 2.5 earthquake occured in region: 6 km E Foligno (PG), on

  • 18-10-1988 01:05:16 (UTC)
  • 18-10-1988 02:05:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9370, 12.7750 at 7 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Foligno PG 6 57155 57155
Trevi PG 7 8469 65624
Spello PG 11 8645 74269
Montefalco PG 11 5679 79948
Campello sul Clitunno PG 13 2442 82390
Bevagna PG 13 5081 87471
Sellano PG 14 1079 88550
Valtopina PG 14 1398 89948
Castel Ritaldi PG 15 3278 93226
Cannara PG 17 4305 97531
Cerreto di Spoleto PG 17 1075 98606
Gualdo Cattaneo PG 18 6155 104761
Nocera Umbra PG 20 5839 110600
Monte Cavallo MC 20 145 110745
Giano dell'Umbria PG 20 3846 114591
Assisi PG 20 28299 142890
Vallo di Nera PG 20 364 143254

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km E of Foligno (57155 inhabitants)
37 Km SE of Perugia (166134 inhabitants)
43 Km N of Terni (111501 inhabitants)
80 Km NE of Viterbo (67173 inhabitants)
82 Km W of Teramo (54892 inhabitants)
83 Km NW of L'Aquila (69753 inhabitants)
93 Km SE of Arezzo (99543 inhabitants)
97 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
Bulletin
Rev1000 		Md 2.5 1988-10-18
01:05:16		 42.937 12.775 7 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 79069
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1988-10-18 01:05:16 ± 0.178
Latitude 42.9370 ± 0.0096
Longitude 12.7750 ± 0.0110
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 79069

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) 1396.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00138
Epicentral distance of station farthest from the epicenter (degree) 0.01295
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 79069
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:14:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.AM8.Z. 1988-10-18T01:05:47.34 10.0 undecidable manual SG 44 0.8547 1.02 0.1
--.AOI.Z. 1988-10-18T01:05:47.30 10.0 undecidable manual SG 44 0.8547 0.98 0.1
--.SDI.Z. 1988-10-18T01:05:43.00 10.0 undecidable manual PN 147 1.443 0.34 0.9
--.ALP.Z. 1988-10-18T01:05:38.60 10.0 undecidable manual SG 104 0.5883 0.52 0.6
--.RSM.Z. 1988-10-18T01:05:37.24 10.0 undecidable manual PG 346 1.0101 0.65 0.6
--.ARV.Z. 1988-10-18T01:05:36.60 10.0 undecidable manual SG 12 0.5661 -0.64 0.3
--.MNS.Z. 1988-10-18T01:05:36.35 10.0 undecidable manual SG 187 0.5439 -0.3 0.6
--.AM8.Z. 1988-10-18T01:05:33.27 10.0 undecidable manual PG 44 0.8547 -0.33 1.2
--.AOI.Z. 1988-10-18T01:05:33.30 10.0 undecidable manual PG? 44 0.8547 -0.3 0.5
--.CIO.Z. 1988-10-18T01:05:30.40 10.0 undecidable manual SG 46 0.3663 -0.35 0.9
--.SS8.Z. 1988-10-18T01:05:30.00 10.0 undecidable manual SG 77 0.333 0.49 0.7
--.CM8.Z. 1988-10-18T01:05:30.39 10.0 undecidable manual SG 46 0.3663 -0.36 0.6
--.ALP.Z. 1988-10-18T01:05:28.30 10.0 undecidable manual PG? 104 0.5883 -0.54 0.4
--.MNS.Z. 1988-10-18T01:05:27.73 10.0 undecidable manual PG 187 0.5439 -0.29 1.6
--.ARV.Z. 1988-10-18T01:05:27.63 10.0 positive manual PG 12 0.5661 -0.73 1.3
--.SS8.Z. 1988-10-18T01:05:24.20 10.0 undecidable manual PG 77 0.333 0.31 1.5
--.CM8.Z. 1988-10-18T01:05:24.34 10.0 undecidable manual PG 46 0.3663 -0.27 1.6
--.CIO.Z. 1988-10-18T01:05:24.30 10.0 undecidable manual PG 46 0.3663 -0.31 3.1
--.ASS.Z. 1988-10-18T01:05:22.71 10.0 undecidable manual SG 324 0.1554 0.13 0.7
--.ASS.Z. 1988-10-18T01:05:20.30 10.0 positive manual PG 324 0.1554 0.41 2.7
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download