Create a soundless explosion that does no damage.

SoundlessTeethlessExplosion.java

package com.comphenix.example;

import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.entity.EntityDamageByBlockEvent;
import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
import org.bukkit.plugin.java.JavaPlugin;

import com.comphenix.protocol.Packets;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.events.ConnectionSide;
import com.comphenix.protocol.events.PacketAdapter;
import com.comphenix.protocol.events.PacketEvent;

public class SoundlessTeethlessExplosion extends JavaPlugin implements Listener {
    private boolean suppressDamage;
    
    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
        
        ProtocolLibrary.getProtocolManager().addPacketListener(
          new PacketAdapter(this, ConnectionSide.SERVER_SIDE, Packets.Server.NAMED_SOUND_EFFECT) {
            @Override
            public void onPacketSending(PacketEvent event) {
                String soundName = event.getPacket().getStrings().read(0);
                
                if ("random.explode".equals(soundName) && suppressDamage) {
                    event.setCancelled(true);
                }
            }
        });
    }
    
    @EventHandler
    public void onEntityDamage(EntityDamageByBlockEvent event) {
        if(event.getCause().equals(DamageCause.BLOCK_EXPLOSION)) { 
            if (suppressDamage) {
                event.setCancelled(true);
            }
        }
    }
    
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (sender instanceof Player) {
            Player player = (Player) sender;
            
            createSoundlessExplosion(player.getLocation());
        }
        
        return true;
    }
    
    /**
     * Create a soundless explosion at a given location.
     * <p>
     * Does not do any damage.
     * @param loc - the location.
     */
    private void createSoundlessExplosion(Location loc) {
        suppressDamage = true;
        loc.getWorld().createExplosion(loc, 10);
        suppressDamage = false;
    }
}

Well done