Earthquake with magnitude of Md 1.8 on date 20-12-1988 and time 04:59:54 (Italy) in region 1 km N Gualdo (MC)

A magnitude Md 1.8 earthquake occured in region: 1 km N Gualdo (MC), on

  • 20-12-1988 03:59:54 (UTC)
  • 20-12-1988 04:59:54 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0740, 13.3370 at 22 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
Gualdo MC 1 815 815
San Ginesio MC 4 3498 4313
Sarnano MC 5 3264 7577
Sant'Angelo in Pontano MC 6 1436 9013
Penna San Giovanni MC 7 1108 10121
Cessapalombo MC 8 512 10633
Ripe San Ginesio MC 8 852 11485
Camporotondo di Fiastrone MC 9 563 12048
Monte San Martino MC 10 765 12813
Colmurano MC 10 1263 14076
Amandola FM 10 3629 17705
Caldarola MC 12 1823 19528
Smerillo FM 12 365 19893
Falerone FM 12 3337 23230
Loro Piceno MC 12 2401 25631
Bolognola MC 13 142 25773
Servigliano FM 13 2336 28109
Montappone FM 13 1682 29791
Belforte del Chienti MC 13 1886 31677
Monte Vidon Corrado FM 13 731 32408
Montefalcone Appennino FM 14 424 32832
Acquacanina MC 14 121 32953
Massa Fermana FM 14 963 33916
Urbisaglia MC 14 2628 36544
Comunanza AP 14 3166 39710
Santa Vittoria in Matenano FM 14 1330 41040
Montefortino FM 15 1178 42218
Fiastra MC 15 559 42777
Tolentino MC 16 20069 62846
Monteleone di Fermo FM 16 395 63241
Belmonte Piceno FM 17 646 63887
Serrapetrona MC 17 966 64853
Mogliano MC 17 4696 69549
Montelparo FM 17 778 70327
Montegiorgio FM 18 6851 77178
Force AP 18 1354 78532
Monsampietro Morico FM 18 659 79191
Montemonaco AP 19 604 79795
Petriolo MC 20 1998 81793

Municipalities with at least 50000 inhabitants

An earthquake occurred to
53 Km E of Foligno (57155 inhabitants)
55 Km NW of Teramo (54892 inhabitants)
62 Km S of Ancona (100861 inhabitants)
77 Km E of Perugia (166134 inhabitants)
80 Km NE of Terni (111501 inhabitants)
80 Km N of L'Aquila (69753 inhabitants)
89 Km S of Fano (60888 inhabitants)
91 Km NW of Montesilvano (53738 inhabitants)
99 Km NW of Pescara (121014 inhabitants)
99 Km SE of Pesaro (94582 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 1.8 1988-12-20
03:59:54
43.074 13.337 22 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 83769
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1988-12-20 03:59:54 ± 0.256
Latitude 43.0740 ± 0.0089
Longitude 13.3370 ± 0.0170
Depth (km) 22 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 83769

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) 1694.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 128
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.00089
Epicentral distance of station farthest from the epicenter (degree) 0.00453
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:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 83769
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:18:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.ASS.Z. 1988-12-20T04:00:13.20 10.0 undecidable manual SG 268 0.4995 0.59 0
--.AOI.Z. 1988-12-20T04:00:13.60 10.0 undecidable manual SG 21 0.4995 0.61 0
--.ALP.Z. 1988-12-20T04:00:07.80 10.0 undecidable manual SG 149 0.333 0.06 0.8
--.AOI.Z. 1988-12-20T04:00:04.90 10.0 undecidable manual PG 21 0.4995 -0.13 1.9
--.ASS.Z. 1988-12-20T04:00:04.60 10.0 undecidable manual PG 268 0.4995 -0.21 0.8
--.CIO.Z. 1988-12-20T04:00:03.50 10.0 undecidable manual SG 310 0.1776 -0.11 0.8
--.ALP.Z. 1988-12-20T04:00:01.90 10.0 undecidable manual PG 149 0.333 -0.1 1.3
--.SS8.Z. 1988-12-20T04:00:01.60 10.0 undecidable manual SG 229 0.0999 -0.34 0.3
--.CIO.Z. 1988-12-20T03:59:59.50 10.0 undecidable manual PG 310 0.1776 -0.11 2.5
--.SS8.Z. 1988-12-20T03:59:58.90 10.0 undecidable manual PG 229 0.0999 0.25 1.7
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